WorksheetsPrep 2 - Science - Prepared by Mr. ASHRAF MOSA MOHAMED
Total questions: 51
Worksheet time: 3570secs
Elements are arranged ascending according to their atomic weights in ............
Modern periodic table
Mendeleev’s periodic table
Moseley’s periodic table
Complete :
The number of known elements until now are (a) elements
Complete :
The number of elements are abundant in the earth’s crust = (a)
Advantages of Mendeleev’s table
Mendeleev predicted the ability of discovering new elements. So he left spaces in his table
He corrected the wrong estimated atomic weights of some elements
He had to make a disturbance in the ascending order of atomic weights for some elements, due to putting them in groups which suit their properties
He also would have to deal with the isotopes of one element as different elements because they are different in their atomic weights.
Disadvantages of Mendeleev’s table
Mendeleev predicted the ability of discovering new elements. So he left spaces in his table
He corrected the wrong estimated atomic weights of some elements
He had to make a disturbance in the ascending order of atomic weights for some elements, due to putting them in groups which suit their properties
He also would have to deal with the isotopes of one element as different elements because they are different in their atomic weights.
.................. discovered that the nucleus of atom contains positively charged protons
Moseley
Rutherford
Mendeleev
Bohr
............... discovered the main energy levels
Moseley
Rutherford
Mendeleev
Bohr
1- Arranged ascendingly according to their atomic numbers
2- The way of filling the energy sublevels with electrons
Modern periodic table
Moseley’s periodic table
Mendeleev’s table
Rutherford
.............. are arranged ascendingly according to their atomic numbers
Modern periodic table
Moseley’s periodic table
Mendeleev’s table
Rutherford
s block .............
has 2 groups
Found in left side of periodic table
has 6 groups
Found in right side of periodic table
p block .............
has 2 groups
Found in left side of periodic table
has 6 groups
Found in right side of periodic table
d block .............
First group 3B and Ending with 2B
Found in the middle of periodic table
has 10 groups
Beginning from period 4
Called Transition elements
Locate the position of Sodium element in the modern periodic table
In group 1A
Period 3
Locate in S block
Active metal
Locate the position of Chlorine element in the modern periodic table
In group 7A or group 17
Period 3
Locate in p block
Active non metal
The element period number
no of energy levels occupied by electron.
no of electron in outermost energy level.
The element group number
no of energy levels occupied by electron.
no of electron in outermost energy level.
The atomic size is determined by known the atomic radius of the atom and its
measuring unit is .....................
Centimeter (cm)
Kilometer (k.m)
picometre (Pm)
Complete :
In periods: by increasing the atomic number(from left to right),the atomic size (a)
Give reason
In periods : by increasing the atomic number(from left to right) the atomic size decreases ?
due to the decrease in the attraction force between the positive nucleus and outermost electrons.
due to the increase in the attraction force between the positive nucleus and outermost electrons.
due to the decrease in the attraction force between the negative nucleus and outermost electrons.
The atomic size of the elements of the same period is ................ proportional to the atomic number.
inversely
Directly
No
Complete :
In groups : by increasing the atomic number (from up to down) the atomic size (a)
Give reason
In groups: by increasing the atomic number (from up to down) the atomic size increase ?
Due to the decrease in the number of energy levels occupied by electrons.
Due to the increase in the number of energy levels occupied by electrons.
The atomic size of elements of the same group is ................. proportional to atomic number.
inversely
Directly
No
The largest atom of element in size is ............... the smallest one is .................
fluorine - cesium
cesium - fluorine
fluorine - Sodium
cesium - Chlorine
It is the ability of the atom in covalent molecule to attract the electron of the chemical bond towards itself
Electronegativity
Atomic size
Atomic radius
Metallic property
In periods :
By increasing the atomic number (from left to right) the electronegativity of the element of the same period is ................. proportional To atomic number.
inversely
Directly
No
............... which have the highest electronegativity
cesium
fluorine
Sodium
Chlorine
They are covalent compound in which the difference in electronegativity between their element is relatively high.
Electronegativity
Atomic size
Atomic radius
Polar compound
.................... , ................... are examples of Polar compound
Water molecule
ammonia molecule
Methane molecule
G.R
Water is consider one of the polar covalent ?
Bec the difference in electronegativity between its elements is
relatively low .
Bec the difference in electronegativity between its elements is
relatively high.
Bec the difference in atomic size between its elements is
relatively high.
Complete :
water molecule H2O
Electronegativity of O = 3.5 H= 2.1
Then diference of Electronegativity between water = (a)
Complete :
The covalent bond is described as a ............ bond when the electronegativity difference between the atoms equal zero ( oxygen molecule O2)
pure
impure
Element in the periodic table are classified into main kinds
Metal
NonMetal
metalloids
Inert gases
They are the elements which have less than four electrons in their outermost energy levels
Metal
Non metal
semi metals
Inert gases
They are the elements which have more than four elements.
Metallic elements tend to gain their outermost electron and change into negative ions to reach to nearest noble gas. Electrons in their outermost
energy levels.
Metal
Non metal
semi metals
Inert gases
They are the elements which have more than four elements.
They are the elements which have the properties of both metal and non metal.
Metal
Non metal
semi metals
Inert gases
In periods :
Starts with ................ by increasing the atomic number:
The metallic property decrease till we reach ................
Then the ........................ property appears and increase till reach the strongest nonmetal and end in inert gas.
strong metal - metalloids - nonmetallic
metalloids - strong metal - nonmetallic
nonmetallic - metalloids - strong metal
.................... the strongest nonmetal.
.................... is the least nonmetal element.
Florine - Bromine
Florine - Chlorine
Florine - Idoine
In the same period
*The atomic size .............
*The electronegativity ..................
* The metallic property .................
* The non metallic property ............
decrease - decrease - decrease - increase
decrease - decrease - decrease - increase
decrease - increase - decrease - increase
Some active metals such as Magnesium react with dilute acids giving salt of acid and hydrogen gas is evolved.
Mg + 2HCl ==> ................. + ..........
MgCl + H2
MgCl2 + H2
MgCl + H2
2MgCl + H2
Reaction of metals with oxygen :
Some metal react with oxygen giving metal oxides which called basic oxides
2Mg + O2 ===> ............
MgO +H2O ===> ............
MgO - Mg(OH)2
2MgO - MgOH
2MgO - Mg(OH)2
MgO2 - Mg(OH)2
It is a series in which metals are arranged in decending order according to their activity
Chemical activity series
Mendeleev’s periodic table
Moseley’s periodic table
Modern periodic table
.................. and .............. React quickly with water and hydrogen gas evolves burn with pop sound
Potassium and sodium
Zinc and iron
Calcium and magnesium
Copper and silver
............... and .............. They react very slowly with cold water.
Potassium and sodium
Zinc and iron
Calcium and magnesium
Copper and silver
........... and ........... They react with hot water at high temperature
Potassium and sodium
Zinc and iron
Calcium and magnesium
Copper and silver
........... and ...........They don’t react with water.
Potassium and sodium
Zinc and iron
Calcium and magnesium
Copper and silver
Acidic oxides :
Nonmetal oxide dissolve in water forming acidic
solution.
C + O2 ===> .............
CO2 + H2O ===> .............
CO2 - H2CO3
CO3 - H2CO3
CO2 - HCO3
Aluminum oxide are known as ............... oxide
They can react with acid and base.
amphoteric
acidic
basic
f block below the periodic table include ............. and ............
lanthanides
actinides
halogens group
alkali group
The group 7A or 17 in periodic table called ............
lanthanides
actinides
halogens group
alkali group
What is your assessment of this effort in the work of the interactive test?
مع تحياتى لطلابى الأعزاء
أ. أشرف موسى محمد
Science teacher
