science 7

how many protons in oxygen

• 4

• 8

• 9

• 10

what type of bonds in water

• ionic bond

• covalent bond

• nothing

what is the valance of nitrogen in nitrogen dioxide (NO₂)

• IV

• II

• I

• III

is nitrogen is a compound? (N₂)

• yes

• no

there are 2 oxygen atoms in a water molecule (H₂O)

• true

• false

what is true about neon

• neon is a metal

• the atomic number of neon is 10

• all true

• neon has 11 protons

click the true

• the unit of molecular mass is amu

• (N₂) is formed by ionic bond

• (CO₂) carbon dioxide is a compound

• (NO₂) the valance of nitrogen in nitrogen dioxide is IV

• all true

fill the blank (give more point)

what atom only has 1 electron?

(5 pts) click all metals

• gold

• plutonium

• radium

• zinc

• argon

hard!

what is the molecular mass of H₂0