They will also be able to explain the meaning of atomic number and atomic mass. About this Lesson. Lessons 2 and 3 both use the 20 sheets of atom description cards – one sheet for each element.

Boron is a metal in group IIIA of the periodic table with atomic number 5, an atomic weight of 10.81, and a density of 2.34 Mg/m 3. Its melting point is 2300 C. The electronic configuration of Boron ...

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.

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.

Alloys created by mixing three atomic species (medium-entropy alloys, or MEAs) or five species or more (high-entropy alloys, or HEAs) have emerged as hot properties in materials science. In ...

Carbon atoms have six protons, so its atomic number is six. Elements also each have a unique atomic mass. The atom's mass primarily comes from the protons and neutrons in the atom's nucleus.

We see that the mass number minus the atomic number is the number of neutrons. We complete the atomic structure by explaining that atoms have the same number of protons and electrons.