Average Atomic Mass

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the mass number defined as?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

What is the mass number of this atom?

• 1

• 3

• 4

• 7

What is the atomic number of Barium, Ba? (enlarge the periodic table)

• 20

• 38

• 56

• 88

Which subatomic particle has a negative charge in the atom?

• proton

• neutron

• electron

• quark

Atoms of the same element which have a different number of neutrons are called _________________.

• ions

• isotopes

• quarks

• molecules

Atoms of the same element which have a different number of neutrons are called _________________.

• ions

• isotopes

• quarks

• molecules

ALL atoms of the same element have:

• same number of proton

• same number of nucleon

• different number of neutron

• different number of electron

which atom has  4 neutrons?

• Li-6
• Li-7
• Li-8
• they have the same # of neutrons

How many neutrons does the isotope below have?     ⁸⁹ ₃₆Kr

• 53
• 36
• 89
• 125