Atoms & the Periodic Table

What is the chemical symbol for Lithium?

• H
• He
• Li
• N

A nucleus of an atom contains what two parts?

• Electrons and Protons

• Neutrons and Electrons

• Protons and Neutrons

How many neutrons does Chlorine (Cl) with an atomic number of 17 and an atomic mass of 35.

• 17

• 18

• 19

How many protons does this element have?

• 40
• 21
• 20
• 41

The periodic table is organized into columns called _______ and rows called ______.

• groups and periods

• periods and groups

• categories and periods

• categories and groups

The part of the atom that determines the identity of the atom is the ____________.

• proton
• nucleus
• electron
• neutron

The number of electrons in the outer energy level is referred to as?

• valence electrons

• outer electrons

• electron cloud

• orbital shells

Why do sodium and potassium have similar properties?

• They both have a full valence energy level.

• They each have only one valence electron.

• They both have few protons.

• They are both non-metals.

How many protons does Neon contain?

• 20.18

• 30.18

• 10

• 5

Which element is Na?

• neon

• sodium

• nitrogen

• natrium