WorksheetsUnit 1 Assessment Review
Total questions: 22
Worksheet time: 11mins
Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below.
Based on these observations, which sample is most likely a nonmetal?
Sample 1
Sample 2
Sample 3
Sample 4
Which of the following is a good conductor of thermal energy?
Nonmetal
metal
Metalloid
How many valence electrons are in an atom of each element in Group 17 on the periodic table?
5
3
7
17
How many valence electrons are in an atom of each element in Group 2 on the periodic table?
12
2
20
4
Metals are dull and brittle.
True
False
Metals can be stretched into thin wires (ductile).
True
False
Which element has chemical properties that are most similar to the chemical properties of aluminum, Al ?
Hydrogen, H
Oxygen, O
Beryllium, Be
Boron, B
Students collected data on five elements. Their data are shown in the table.
Which element has the same number of energy levels as sodium?
Lithium
Magnesium
Beryllium
Potassium
Which pair of elements are nonmetals and gases at room temperature and normal atmospheric pressure?
Nickel, N and Copper, Cu
Silicon, S and Germanium, Ge
Nitrogen, N and Neon, Ne
Potassium, K and Calcium, Ca
The atoms of elements belonging to the same group in periodic table have the same :
number of protons
number of neutrons
number of electrons
number of valence electrons
Which element has 15 proton, 16 neutrons, and 5 valence electrons?
Silocon, Si
Phosphorous, P
Oxygen, O
Strontium, Sr
Atoms of which two elements are represented by these models?
Beryllium, Be and Magnesium, Mg
Helium, He and Carbon, C
Selenium, Se and Bromine, Br
Gold, Au and Silver, Ag
Oxygen and Sulfur have similar chemical properties. What characteristic of these elements explains why they are chemically similar?
Their atoms have the same number of energy levels.
Their atoms both have six valence electrons
Their atoms both have the more neutrons than protons.
Their atoms contain equal numbers of protons and electrons.
What is the part of an atom that determines the identity?
Neutrons
Electron cloud
Valence Electrons
Protons
What is the part of an atom that determines its chemical properties?
Neutrons
Electron cloud
Valence Electrons
Protons
A model of a beryllium atom is shown below. What types of particles are found in the nucleus of an atom?
electrons and neutrons
protons and neutrons
Electrons and protons
protons only
If an Argon atom has a mass number of 40, how many neutrons are in the atom?
18
22
20
58
Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown above?
It has mass but no charge.
It has a large mass and a negative charge.
It has no mass and a positive charge.
It has no mass and an equal number of positive and negative charges.
How many neutrons are in the nucleus of a Boron atom with a mass number of 11?
6
11
13
5
Which statement would be most helpful in determining an element’s reactivity?
The element has the same number of electron shells as iodine
The element has 47 neutrons
The element has the same number of valence electrons as cesium
The element is a metal
Compare the data shown in the table. What reasonable conclusion can be made from the information given?
Element 1 has the same atomic mass as Element 4
Element 3 has a very similar chemical properties as Element 4
Element 1 has very similar chemical properties as Element 3
None of the above
Which one of the following statements are FALSE about subatomic particles?
I. The charge of electron is opposite to the charge of proton.
II. Proton has approximately the same mass as a neutron.
III. Electrons and protons are located within the nucleus.
IV. Most mass of an atom is found in the nucleus.
I
II
III
IV
