Earth’s surface did not solidify during the first half billion years after its formation because A. the planet spun too fast.
B it was completely covered by water.
C: clouds of dust and gas made the air too dense.
D: meteorite bombardment made Earth’s surface hot and liquefied.

Need on both questionswill markbr />

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5