Atoms, Elements, Compounds and Mixtures

The smallest piece of matter that still has the properties of an element is a(n)

• molecule

• atom

• nucleus

• electron

Which subatomic particle has a positive charge?

• neutron

• electron

• proton

• atom

How many protons are there in an atom with an atomic number of 23 and an atomic mass of 51?

• 23

• 28

• 51

• 74

How many electrons are there in an atom with an atomic number of 23 and an atomic mass of 51?

• 23

• 28

• 51

• 74

How many NEUTRONS are there in an atom with an atomic number of 23 and an atomic mass of 51?

• 23

• 28

• 51

• 74

If an atom has a zero overall charge, it contains an equal number of

• neutrons and protons

• neutrons and electrons

• protons and electrons

An atom of fluorine with 9 protons, 9 electrons, and 10 neutrons would have an atomic mass of

• 9

• 10

• 18

• 19

Which subatomic particle has a mass of zero (compared to the other subatomic particles)?

• proton

• electron

• neutron

• nucleus

The nucleus of an atom is made of

• protons and neutrons

• electrons and neutrons

• neutrons

• electrons, protons and neutrons

How many electrons can the K shell hold?

• 2

• 4

• 8

• 18