Elements Answers

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.

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

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

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

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

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

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

The simple model below is a neutral magnesium (Mg) atom with the element’s most common mass number.

The model below shows a calcium atom.

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