If you combine elements into other substances, the properties of these substances are always the same as the base elements.
Required
1 point
1
Question 4
4.
Which of the following elements DO NOT have an atomic symbol that matches with the first letter of that element?
Required
1 point
1
Question 5
5.
Scientists have observed that atoms in families share the same _______.
Required
1 point
1
Question 6
6.
What is one characteristic that makes gold so valued for jewelry over metals like nickel and copper?
Required
2 points
2
Question 7
7.
Select the statements that are considered true.
Required
1 point
1
Question 8
8.
Using the periodic table, explain why rubidium (Rb) has higher ionization energy than cesium (Cs).
Required
1 point
1
Question 9
9.
Using calcium’s atomic structure, as shown in the image, what is this element’s atomic number?
Required
1 point
1
Question 10
10.
Draggable item
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Corresponding Item
electron(s)
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found in a cloud that orbits an atom's nucleus
nucleus
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subatomic particles that has a positive charge
proton(s)
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subatomic particles that has no charge
atomic number
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equal to the number of protons
neutron(s)
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made up of protons and neutrons
Required
1 point
1
Question 11
11.
If a neutral atom of Gallium (atomic number 31) has 39 neutrons in its atomic nucleus, which of the following statements are true?
Explore 1
3 points
3
Question 12
12.
The reactivity of metals tends to decrease from __________ to __________ across the periodic table. The reactivity of metals also tends to increase as you move __________ within a group.
1 point
1
Question 13
13.
Why does the size of the atom (atomic radius) decrease as you move left to right on the periodic table?
1 point
1
Question 14
14.
As you move from left to right in the periodic table, what trend do we see in regard to the density of metals?
1 point
1
Question 15
15.
How does reactivity change as you move through the periodic table.
