UCEA C3 Structure & Bonding

How many valence electrons are elements trying to reach in their outer shells?

• 1
• 2
• 5
• 8

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

What determines the reactivity of an element?

• Size of its nucleus
• Number of total electrons
• Number of valence electrons
• Number of shells

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

How many valence electrons does lithium have?

• 1
• 3
• 6.9
• 7

This could be the dot diagram of

• Be
• B
• C
• Ne

Tags

NGSS.HS-PS1-1

When two atoms share electrons, a chemical bond is formed.  This type of bond is called:

• covalent bond
• ionic bond
• crystal bond
• polyatomic bond

Tags

NGSS.HS-PS1-1

What two types of atoms make a covalent bond?

• 2 Nonmetals
• 1 Nonmetal and 1 Metal
• 2 Metals
• 2 Noble Gases

Tags

NGSS.HS-PS1-1

What is the correct formula for this molecule?

• NH
• N₃H
• NH₃
• NH₄

Tags

NGSS.MS-PS1-1

What type of elements will form an ionic bond?

• Metals + Metals
• Nonmetals + Nonmetals
• Metals + Nonmetals
• None of the above

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Ionic bonds form when ions share electrons.

• True
• False

How are covalent bonds formed?

• Sharing of electrons
• Transfer of electrons