physics part 8
What was J.J. Thomson Plum pudding model?
A sphere of positive charge, with negatively charged electrons imbedded inside it
Why doesn't the nucleus in an atom break apart?
Due to the Strong Nuclear Force that balances repulsion and holds the nucleus together
Why can elements not be broken down by chemical reactions?
Because elements are in their simplest chemical form
What is the mass number in an element?
The total number of protons and neutrons in the nucleus
What are isotopes?
Atoms of the same element that have different number of neutrons but have the same amount of protons
How many protons and neutrons are in carbon-14?
6 protons and 8 neutrons
What do elements that are in the same group of the periodic table have in common?
They all have the same number of electrons in their outer shell
What do elements in the same period of the periodic table have in common?
They have the same number of electron orbitals