Atoms, Bonding and Formulae

Which of these is covalent?

• NaCl

• Pb(NO₃)₂

• CO₂

• AlCl₃

Which elements tend to lose electrons?

• metals

• nonmetals

Which of the following is relevant for copper?

• Ion

• Ionic bonding

• Metallic bonding

• Covalent bonding

Magnesium bromide is an ionic compound with the chemical formula MgBr₂. What does the "2" tell you?

• There are 2 bromide ions for every magnesium ion

• Bromide has a 2- charge

• Bromide has a 2+ charge

• There are 2 magnesium ions to every bromide ion

When an atom loses an electron, it becomes a:

• positive ion

• negative ion

• neutral ion

• neutral atom

Atoms form ions in order to become

• isotopes

• stable

• metals

• nonmetals

Electrons involved in chemical bonding.

• valence

• ionic

• covalent

• metallic

Each dot on a dot diagram represents one

• proton

• atomic mass unit

• energy level

• valence electron

Tags

NGSS.HS-PS1-1

What is the charge on a Hydrogen ion?

• +1

• 1

• 2

• -2

How many valence electrons does calcium have?

• 2

• 4

• 6

• 7

Tags

NGSS.HS-PS1-1