Which vital element for life participates in the carbon, nitrogen, and phosphorus cycles?

O

A. oxygen

o

B. sodium

O

C. calcium

O

D. chlorine

Draw Bohr model of atom with atomic number 16 and name the element. What is the valency of the atom? What type of ion does it form and what will be the value of the charge on the ion produced? Justify the answer.

How can you tell which elements have the most similar chemical properties

Which explains why carbon (C) is such a versatile element? It can form four covalent bonds. It can form only ionic bonds. It can form both ionic and covalent bonds. It can form three ionic bonds.

Acid precipitation can be traced back to the burning of fossil fuels. a. True b. False

When you add water to calcium oxide it makes calcium hydroxide

The density of water is 1.0 g/cm3 will rubbing alcohol float with a density of 0.81 g/cm3

Write an equation that shows the formation of the phosphide ion from a neutral phosphorus atom.

Which of the following terms is defined by the measure of mass per unit of volume? gravity density weight acceleration

Select the lon. O NO₂ H2SO4 O A3

True or False: A Solar eclipse occurs when Earth casts a shadow on the Moon.