WorksheetsGr7 ASCR
Total questions: 42
Worksheet time: 19mins
Who was the first scientist to introduce practical model of an atom?
J. J. Thompson
Maharishi Kanada
John Dalton
Democritus
What is Dalton’s atomic model known as?
Plum Pudding Model of an Atom
Bowling ball model
Solid sphere model
Bowling ball model as well as Solid sphere model
A/an ____________ is formed by the combination of two or more atoms of different elements.
electron
proton
matter
compound
Who proved the theory of atoms being indivisible as wrong?
Dalton
Thomson
Rutherford
Bohr
Electrons are ____________ subatomic particles.
negatively charged
positively charged
having no charge
neutrally charged
The electrons in an atom move from a ____________ energy level to a ____________ energy level by gaining energy.
lower, higher
higher, lower
lower, lower
higher, higher
The entire mass of an atom is concentrated in a very small space called ____________.
compound
nucleus
electron
proton
The distribution of electrons revolving around the nucleus of an atom in different orbits or shells is called ____________.
electronic orbit
electronic configuration
electronic buildup
orbits
The maximum number of electrons that can exist in the outermost shell or orbit of any atom is _____________.
eight
eighteen
thirty-two
two
In an atom, the mass number of an atom is equal to the number of ____________.
protons and neutrons
neutrons
protons
protons and electrons
If Z represents the atomic number and A represents the mass number, then the number of neutrons in an atom can be found out by ____________.
A + Z
A - Z
Z - A
Z
If the atomic number of an element is 17 and mass number is 35, then the number of protons and neutrons in the atoms of that element will be ____________ and ____________ respectively.
17, 18
17, 17
18, 17
18, 18
Maximum number of electrons that can be accommodated by the first shell of any atom is ____________.
2
4
8
18
2311Na depicts that there are ____________ neutrons in the nucleus of its atom.
12
11
23
13
What is the unit of atomic mass?
Dalton
Atomic Mass Unit
All of the them
a. m. u.
The positively charged ions are called ____________.
anions
cations
zwitter ions
neutral ions
The positively charged ions are called ____________.
anions
cations
zwitter ions
neutral ions
____________ ion is an example of a cation.
Oxygen
Chlorine
Sodium
Fluorine
When a neutral atom accepts one or more electrons, there is a formation of ____________.
anions
cations
zwitter ions
neutral ion
In a chloride ion, there are ____________ protons and ____________ electrons.
18, 17
17, 17
18,18
17, 18
Nitride ion is formed by nitrogen by the gain of ____________ electrons.
1
2
3
4
Aluminium ion is formed by the loss of ____________ electrons.
1
3
5
7
Oxide ion has a ____________ electric charge?
-1
-2
+1
+2
The octet rule refers to the tendency of atoms to prefer to have ____________ electrons in the outermost shell.
eight
eighteen
two
thirty two
The symbol for ammonium ion is ____________.
NH4+
NaH4+
N2H4+
NoH4+
SO32- is the symbol for which ion?
Sulphide
Sulphite
Sulphate
All of these
Which method is used for assigning a molecular formula to a compound?
crisscross
crossover
crossword
All of these
While assigning molecular formula to the compound the ____ions is written first.
positive
negative
anion
any of the
The charge of the ion or the valency of an element is written in the form of _____on the ____side
superscript, right-hand
subscript, right -hand
superscript, left hand
subscript, left-hand
The final formula of a compound is written ___ the charge or valency of the atom or ion
with
without
along with
with or without
The formula of hydrogen sulfide is
H2S2
H2S
H2SO4
H2SO3
The valency of carbonate ion in Sodium carbonate - Na2CO3 is
-2
+2
+4
+3
Oxygen combines with different elements to form corresponding oxide.
Based on this we can predict
Zinc + Oxygen --> __________
Zinc oxygen
Zinc oxide
Oxyzinc
Zinc carbonate
What is the formula of Calcium hydroxide
Ca2(OH)2
CaOH2
Ca(HO)2
Ca(OH)2
The suffix ____________ means that the compound contains oxygen along with other elements in its name.
-ide
-ite
-ate
-ous
10. Carbon tetrachloride has ____________ (number) atoms of chloride.
1
2
3
4
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
Identify the type of chemical reaction
Synthesis
Decomposition
Single replacement
Double replacement
