LI 4: We are learning to describe Atoms
Read this website and answer the following questions about atoms:
What is an atom?
A block of particles that mack up our planet. Every atom is different depending of the object.
What is a proton?
A positive charge in the nucleus.
What is a neutron?
Neutrons don’t have a charge. The mass of the neutrons affect the radioactivity.
What is an electron?
A negative charge outside the nucleus.
Each element has a different number of protons. This is how we tell them apart. They also have different number of neutrons and electrons, but these can change. Helium has 2 protons so its atomic number is 2, it also has 1 or 2 neutrons and 2 electrons. This is different to Lithium which has 3 protons and an atomic number of 3. It also has 3 electrons and 3 or 4 neutrons. Each element has its own symbol.