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Which particle in an atom has a negative charge?

• 1 Nucleus
• 2 Neutron
• 3 Electron
• 4 Proton

The atomic number of an element is the number of:

• 1 Neutrons
• 2 Protons
• 3 Shells
• 4 Protons plus neutrons

An atom has 11 protons and 12 neutrons. What is its mass number?

• 1 12
• 2 1
• 3 23
• 4 11

Atoms of the same element with different numbers of neutrons are called:

• 1 Isomers
• 2 Isotopes
• 3 Isobars
• 4 Ions

What is the electronic configuration of sodium (atomic number 11)?

• 1 8, 3
• 2 2, 9
• 3 2, 8, 2
• 4 2, 8, 1

Which scientist discovered the nucleus?

• 1 Bohr
• 2 Dalton
• 3 Rutherford
• 4 Thomson

The number of electrons in a neutral atom equals its number of:

• 1 Protons
• 2 Nucleons
• 3 Shells
• 4 Neutrons

The maximum number of electrons in the first shell is:

• 1 8
• 2 18
• 3 2
• 4 1

Which particle has no charge?

• 1 Positron
• 2 Electron
• 3 Neutron
• 4 Proton

Chlorine has isotopes with mass numbers 35 and 37. They differ in the number of:

• 1 Electrons
• 2 Shells
• 3 Protons
• 4 Neutrons