AnswersAZ-Physical Science A-CRAtomic Theory

Periodic Table Answers

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1
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The model below shows a calcium atom.

Question illustration
A
2
B
8
C
18
D
20
2
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The simple model below is a neutral magnesium (Mg) atom with the element’s most common mass number.

Question illustration
A
It must lose two neutrons and become a different isotope.
B
It must gain two neutrons and become a different isotope.
C
It must lose two electrons and become an ion.
D
It must gain two electrons and become an ion.
3

Which describes an atom that has fewer neutrons than protons and more electrons than protons?

A
negative compound
B
positive compound
C
positive ion
D
negative ion
4

The model below shows a carbide ion.

Question illustration
A
remove 2 electrons
B
add 2 electrons
C
remove 4 electrons
D
add 4 electrons
5

All large radioactive atoms decay into smaller atoms by releasing alpha particles. Each alpha particle has 2 protons, 2 neutrons, and 0 electrons. The table below describes several neutral, low-mass atoms.

Question illustration
A
lithium-7
B
helium-4
C
hydrogen-2
D
helium-2
6

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.
7

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
8

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.
9

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

A
4
B
7
C
11
D
18
10

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?

A
energy
B
mass
C
neutrons
D
electrons

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