practice for test - Ch. 3 atoms and bonding

Electrons involved in chemical bonding.

• valence

• ionic

• covalent

• metallic

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Each dot on a dot diagram represents one

• proton

• atomic mass unit

• energy level

• valence electron

Tags

NGSS.HS-PS1-1

Which noble gas is an exception to the rule of 8 valence electrons creating chemical stability?

• helium

• hydrogen

• neon

• radon

How many valence electrons does calcium have?

• 2

• 4

• 6

• 7

When an atom gains electrons, it becomes a

• positive ion

• negative ion

• neutral ion

• neutral atom

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

Tags

NGSS.MS-PS1-1

An atom's valence electrons are those electrons that have the HIGHEST energy

• True
• False

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Atoms tend to be stable and nonreactive if they have SIX valence electrons. 

• True
• False

Which scientist developed the atomic theory?

• JJ Thomson
• Ernest Rutherford
• John Dalton
• James Chadwick

James Chadwick discovered the ________.

• proton
• neutron
• electron
• nucleus