To find the number of electrons an element has, locate it on the periodic table of elements, find the atomic number, and note the number of protons; because atoms are naturally electrically neutral, the protons and elect... More »

According to, "An atom consists of a small, dense, positively charged nucleus surrounded by electrons that whirl about it in orbits, forming a cloud of charge." In a broad sense of the term, electrons are e... More » Science Physics Particle Physics

Magnesium has two valence electrons. Valence electrons determine the chemical properties of an atom. The periodic table of elements is used to find the number of valence electrons in an element. More » Science Chemistry Atoms & Molecules

The Roman numerals on a periodic table of elements define the chemical group of the elements in that column and identify the number of valence electrons of each element. Group IA elements have one valence electron; group... More »

An atom of chromium with no charge has a total of 24 electrons, as indicated by the element's atomic number on the periodic table of elements. The atom also holds 24 protons and 28 neutrons. More »

Moving across periods on the periodic table from left to right, the atoms tend decrease in radius size because each atom has more protons than the atom before it, meaning there is more of an attractive force in the nucle... More »

An element is defined as a substance made up of atoms with a specific number of protons. That means that every atom with 1 proton is always a hydrogen atom. Elements cannot be broken down further by chemical means and al... More »