Atomic number 16, atomic weight 32.064. Silicon (Si): Silicon is the second most abundant element in the earth's crust and can be found in rocks, sand and clay.

Let's try an example: We can choose selenium, which has an atomic number of 34, meaning there are 34 total electrons in a neutral atom of selenium. This non-metal resides in Period 4, Group 6A.

16 Neutrons—Phosphorous or Sulfur; 20 Neutrons—Potassium or Calcium; ... The presentations should be short and can include: atom name, atomic number, derivation of name, natural sources of the element ...

Atomic Number and Atomic Mass: Get here the easy notes on atomic number and atomic mass for all the first 30 elements. Know how to calculate atomic mass using atomic number.

Atoms are made up of protons, neutrons, and electrons. The number of protons in one atom of an element is its atomic number. Hydrogen has one proton, so its atomic number is one. Carbon atoms have ...

It's what makes one element different from another. The number of protons in an atom is called its atomic number. The atoms of each element in the periodic table have different number of protons ...