Consider a Ca atom with a charge of +2 and a mass number of 44. This type of ion is called a/an
How many protons in the nucleus?
How many neutrons in the nucleus?
How many electrons in the electron cloud?
If this Ca gained 4 new electrons, what would the charge be?

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d

How many moles are contained in 5.6 l of h2 at stp