Atomic Number, Mass Number and Isotopes

In an atom, there are three types of subatomic particles. ______ are positively charged, ______ are negatively charged, and ______ are neutral.

• Protons, Electrons, Neutrons

• Electrons, Protons, Neutrons

• Neutrons, Protons, Electrons

• Electrons, Neutrons, Protons

The identity of a chemical element is always determined by which of the following?

• the number of protons it has

• the number of neutrons it has

• the number of electrons it has

Mass number represents the....

• protons + neutrons

• neutrons + electrons

• protons + electrons

If a hydrogen atom has 1 proton, 1 electron, and 1 neutron, its atomic number is:

• 1
• 2
• 3

Isotopes of the same element have the same number of ________ but a different number of _______.

• protons, neutrons

• neutrons, protons

• protons, electrons

• electrons, neutrons

How many neutrons does the isotope of lithium have?

• 8
• 3
• 5

How many protons does this isotope of titanium have?

• 48
• 22
• 26

If a sulfur atom has 16 protons, 16 electrons, and 16 neutrons, its mass number is:

• 16
• 32
• 48

What is the name of the pictured isotope?

• Copper-29
• Copper-63
• Copper-34

Which of the following are isotopes?

a) ¹⁴ ₇X b) ¹⁴ ₆X c) ¹⁵ ₇X d) ¹⁵ ₈X

• a) and b)

• a) and c)

• c) and d)

• a) and d)