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WorksheetsChemistry-STAAR Review
Total questions: 38
Worksheet time: 1hrs 10mins
Based on the data, which number shows the correct location of the element with 2 valence electrons and 3 energy levels.
1
2
3
4
Based on the data, which number shows the correct location of the element with 2 valence electrons and 1 energy levels.
1
2
3
4
Which statement best describes the position of the two elements in the periodic table.
The two elements are in the same period, with Mg the first element in the period table and Ca the last element
The two elements are in the same group, with Mg just above Ca
The two elements are side by side in the same period, with Ca to the left of Mg
The two elements are in the same group, with Ca just below Mg
Which of these elements is in this group?
Lithium
Silicon
Aluminum
Strontium
Which two elements on the periodic table are in the same group?
Na and He
O and C
Li and Ne
He and Ar
Which pair of properties describes the elements in Group 1?
They are chemically stable
They have 8 valence electrons
They are the most reactive metals
They are the most reactive non metals
How many valence electrons are in an element in group 15 in the periodic table?
5
15
7
8
Which two atoms are elements in the same group in the periodic table?
Atom 3 and Atom 4
Atom 1 and Atom 4
Atom 3 and Atom 2
Atom 1 and Atom 2
Which two atoms are elements that belong in period two in the periodic table?
Atom 3 and Atom 4
Atom 1 and Atom 4
Atom 3 and Atom 2
Atom 1 and Atom 2
Based on the data, which number shows the correct location of the element that is brittle and dull.
1
2
3
4
Based on the data, which number shows the correct location of the element that is malleable and a good conductor.
1
2
3
4
What are valence electrons?
Any of an atom's electrons
Electrons located on the first energy level
Electrons not attached to any atom
electrons located on the outer energy level
How many valence electrons does a carbon atom have?
8
4
2
6
How do you calculate the number of neutrons? *
Mass = Atomic number - Neutrons
Mass - Atomic number = Neutrons
Atomic number = Neutrons
Elements in the same period/row have the same--
# of valence electrons
# of protons
# of energy shells
# of neutrons
An element is shiny, solid at room temperature, and has two valence electrons. Which of these elements could be in this group?
Lithium (Li)
Strontium (Sr)
Aluminum (Al)
Silicon (Si)
Valence electrons determine an atom's--
proton number
chemical reactivity
atomic mass
atomic number
When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with? (8.5B)
The total number of neutrons in the unknown element
The total number of particles in the nucleus of the unknown element
The number of protons in the nucleus of the unknown element
The number of valence electrons in the unknown element
Which two elements on the periodic table are in the same period? (8.5C)
Sn and Rb
K and Ba
F and Cl
Se and Te
A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment? (8.5C)
Nitrogen (N)
Arsenic (As)
Sulfur (S)
Silicon (Si)
A model of an atom is shown. How many valence electrons does the above atom have? (8.5A)
5
2
11
3
Which group of lists best summarizes the subatomic particles and their electrical charge?
proton, negative
neutron, positive
electron, no charge
proton, positive
neutron, no charge
electron, negative
proton, positive
neutron, negative
electron, no charge
proton, no charge
neutron, positive
electron, negative
These elements are in a:
group
period
which elements have 4 valence electrons?
group 3
group 4
group 14
Which elements have 1 valence electron?
period 1
group 1
group 4
What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al? (8.5A)
13
34
52
21
Do these elements have properties in common?
yes
no
