Unit 2: Matter & Atoms

Which atomic particle has no charge?

• proton

• electron

• neutron

• valence electron

Groups on the periodic table are the horizontal rows.

• True

• False

How many protons does Oxygen have?

• 1

• 8

• O

• 16

Tags

NGSS.MS-PS1-1

How many energy levels does potassium have?

• 1

• 19

• 39

• 4

Tags

NGSS.HS-PS1-1

All the elements in Group 2 have the same

• atomic mass

• # of valence electrons

• chemical symbol

• atomic number

How are atoms arranged in the modern periodic table?

• by increasing atomic #

• by increasing atomic mass

• by decreasing atomic mass

• by decreasing atomic #

How many valence electrons are present in at atom of argon?

• 3

• 8

• 18

• 40

When do atoms form a covalent bond?

• when they give up electrons

• when they accept additional electrons

• when electrons remain with the same atom

• when they share electrons

Most atoms gain, lose, or share electrons to end up with how many valence electrons?

• 12

• 16

• 8

• 4

Which of these descriptions is a property of a base?

• feels slippery

• tastes sour

• reacts with metal

• reacts with carbonates