Fichas
Chemistry FlashCards
Fichas del conjunto (9)
- 1What is an atom?The smallest particle of a chemical element that can exist.
- 2What is the nucleus?Its an organelle in the atom which contains protons and neutrons.
- 3What is an electron?A negatively charged object which occupy shells/energy levels.
- 4What are protons?A particle occurring in the nucleus, with a positive electric charge. They are around the shells. Relative mass of 1.RElative charge of +1.
- 5What are electrons?A particle with a charge of negative electricity. They are around the shells. Relative mass of 1/2000.Relative charge of -1.
- 6What is the atomic number?The number of protons. Which are equal to the number of electrons.
- 7What is the mass number?The total numbers of protons and neutrons combined
- 8What are isotopes?The different atoms of the same elements, which have the same number of protons but different neutrons (different mass).
- 9Who was Dmitri Mendeleev?He was a man who ordered the periodic table in 1869.