Elements Answers

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

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.

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

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

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

The model below shows a calcium 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.

What is the number at the end of an isotope’s name?

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

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