What can be found in the nucleus of an atom?

• electrons only

• neutrons and protons

• protons only

• neutrons and electrons

Isotopes of an element have different number of ...

• protons

• electrons

• neutrons

• mass

In a correctly written symbol what would be located in the "A" position?

• number of neutrons

• number of electrons

• atomic number

• mass number

Isotopes are atoms of the same element that have the same number of __________ but different number of __________ . Therefore, isotopes of the same element have different masses.

• protons, neutrons

• protons, electrons

• neutrons, protons

• electrons, protons

An atom's atomic number is equal to ...

• the number of protons in the atomic nucleus

• the number of electrons in the atom

• the number of neutrons in the atom's nucleus

• the total of protons + neutrons

What does it change in an ion?

• the number of electrons

• the number of neutrons

• the number of protons

• the number of megatrons

What charge does an atom have when it GAINS electrons?

• positive

• negative

• neutral

• unidentified

Based on the isotope notation, what happen to the Mg element?

• It loses electrons

• It gains protons

• It gains electrons

• It loses protons

How many protons does this isotope of titanium have?

• 48

• 22

• 26

• 70

How many neutrons does the isotope of lithium have?

• 8

• 3

• 5

• 11