Vertical columns of elements that DO share chemical properties (react the same) because they have the same number of VALENCE ELECTRONS in their outer shells.

• Groups

• Periods

Horizontal rows of elements that share the same number of ENERGY LEVELS but DO NOT share chemical properties.

• Groups

• Periods

The periodic table is arranged by increasing ______ ______, which is equal to the number of protons.

• atomic mass

• atomic number

The atomic number tells us the number of ____________?

• Neutrons
• Protons
• Electrons

The mass number is the ______________ + ____________ in the atom.

• neutrons + electrons

• protons + electrons

• protons + neutrons

• electrons

The chemical symbol for Carbon is?

• C

• Ca

• K

• Cl

What particles make up the nucleus?

• electrons and protons

• electrons and neutrons

• electrons, protons, and neutrons

• protons and neutrons

What particles are not in the nucleus of an atom?

• protons

• electrons

• neutrons

• protons and neutrons

Electrons are particles that..

• have a positive charge

• have a negative charge

• have no charge

• have a Visa charge card

Tags

NGSS.MS-PS2-5

Protons are particles that..

• have a positive charge

• have a negative charge

• have no charge

• have a Visa charge card