Unit 1 Test Physical Science (WAVE) q2

Who proposed the theory that atoms orbit the nucleus in specific orbits.

• Bohr

• Democritus

• Rutherford

• Chadwick

This particle balances the charges from the protons to make the atom neutral

• proton

• electron

• neutron

• nucleus

These particles are found in the nucleus

• protons and electrons

• nucleus and neutrons

• protons and neutrons

• electrons and neutrons

Rutherford discovered what part of the atom

• nucleus

• neutron

• proton

• electron

What is the mass of an atom if it has 11 protons, 12 neutrons, and 11 electrons?

• 22
• 11
• 34
• 23

A small, dense region composed of protons and neutrons at the center of an atom.

• Electron

• Isotope

• Nucleus

• Orbital

A subatomic particle with no net electrostatic charge, with a very similar mass to a proton.

• Electron

• Lepton

• Neutron

• Muon

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15

• 31

• 16

• 47

The negatively charged particles of an atom are the ______.

• electrons
• protons
• neutrons
• protons & neutrons

What is the atomic number of chlorine?

• 35

• 18

• 7

• 17