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Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?

A
The liquid contains only one compound.
B
The liquid contains only one element.
C
The liquid contains only neutral electrons.
D
The liquid can be broken down into simpler substances.
2
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A potassium atom (atomic number 19) loses an electron while forming a bond with another atom.

A
It is a negative ion that has one less valence electron than a neutral potassium atom.
B
It is a negative ion that has one more valence electron than a neutral potassium atom.
C
It is a positive ion that has one less valence electron than a neutral potassium atom.
D
It is a positive ion that has one more valence electron than a neutral potassium atom.
3

Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained.

A
They each have the same number of nuclear particles.
B
They each have the same number of neutral particles.
C
They each have the same number of neutrons.
D
They each have the same number of protons.
4

The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electrons?

A
Ca–
B
Ca+
C
Ca–2
D
Ca+2
5

If we have a sample of silicon (Si) atoms that has 14 protons, 14 electrons, and 18 neutrons

A
silicon-14
B
silicon-32
C
silicon-46
D
silicon-153

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