Atomic Theory and Structure

The massive, neutral subatomic particle

• proton

• neutron

• electron

tiny, negatively charged subatomic particle

• proton

• neutron

• electron

The massive, positive subatomic particle

• proton

• neutron

• electron

Which element has an atomic number of 63?

Which element has the atomic number 17?

What is the atomic number of bromine?

• Br

• 35

• 79.904

• 45

Which element has 78 protons?

What element has 41 protons and 41 electrons?

Which have no electrical charge?

• protons

• neutrons

• electrons

Reorder the following from earliest discovery to the most recent.

• protons

• electrons

• whole number ratios

• neutrons

• atomos