What is the atomic number of an element?

a. The number of valence electrons

c. The number of electrons in the inner most shell

b. The number of protons in the nucleus

d. The total number of electrons

How many valence electrons does magnesium have

Which statement best describes how the periodic table has benefited society and scientists? a. It has evolved as new information about the elements has been discovered. b. It includes a lot of detailed information about the elements in a small space.

The element chlorine has an atomic weight of 35.5 and consists of two stable isotopes chlorine-35 and chlorine-37. The isotope chlorine-35 has a mass of 35.0 amu and a percent natural abundance of 75.5 %.

In the presence of an acid catalyst, cyclohexanol (100.16 g/mol) is dehydrated to give cyclohexane (82.14 g/mol) and water. A dehydration reaction starting with 3.3 g cyclohexanol produces 2.4 g cyclohexene.

Mention two instruments that could be used to transfer sodium hydroxide solution into conical flask

Some polymers are elastic because they are made of a. carbon. c. sugar and alcohol. b. phosphate ladders. d. cross-linked chains.

The hot converting blank is the layer of rock between the earths crust and core

Compare the compressibility of gases and liquids. Support your answer by describing the arrangement of particles in gases and liquids.

Why are ionic crystals soluble in water?

What group is more reactive than the alkaline earth metals