Bohr Diagram for Ca please dont scam me i really need help. Can you tell me also how many electrons it gained or lost

Layers of rock containing fossils, like the layers illustrated here, are most likely composed of rocks.

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h