Elements Answers

All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39.

The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electrons?

A potassium atom (atomic number 19) loses an electron while forming a bond with another atom.

One way in which elements differ from each other is the structure of the electron cloud in each element’s atoms. In an electron cloud, an electron that is farther away from the nucleus has

Scientists are working with a liquid that is made of only one type of atom. Which statement correctly describes this liquid?

The model below shows a carbide ion.

If we have a sample of silicon (Si) atoms that has 14 protons, 14 electrons, and 18 neutrons

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron?

Which describes an atom that has fewer neutrons than protons and more electrons than protons?

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?