Elements Answers

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?

All large radioactive atoms decay into smaller atoms by releasing alpha particles. Each alpha particle has 2 protons, 2 neutrons, and 0 electrons. The table below describes several neutral, low-mass atoms.

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

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

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

The model below shows a calcium atom.

Which are different forms of an element that have different numbers of neutrons?

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

Uranium is an element that is often used in nuclear power plants. Uranium atoms are very large, and the substance can be dangerous if it is not carefully contained.