How many electrons will an element have if it has an atomic number of 20, an atomic mass of 40 and a charge of +2? *
A.)40
B.)18
C.)22
D.)20

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Why do cells appear different in distilled water than they do in 10% salt water?

Avariable that is not being directly tested during an experiment should be