C1.2- Atomic Structure Flashcards
What is an atom?
an atom is the smallest particle of an element that still has its chemical properties
What is a molecule?
A molecule is made from 2 or more atoms joined together. They are joined by bonds
Do molecules have different chemical and physical properties from the atoms they contain?
Yes
What is a bond length?
It is the distance between the centres of two joined atoms
What is 1 nanometer in standard form?
10^-9
What is the relative mass of a proton
1
What is the relative mass of a neutron
1
What is the relative mass of an electron
0.0005
What is the atomic number?
It is the number of protons in its nucleus
What is the mass number
The total number of protons and neutrons
How do you calculate the number of neutrons?
Mass number ➖atomic number
What are isotopes
Isotopes are atoms with the same number of protons and electrons but a different number of neutrons.
How does being an isotope affect its chemical and physical properties?
The chemical properties of an element depend on the number of electrons in its atom. All the isotopes of an element have the same number of electrons so they have identical chemical properties. However the number of neutrons may affect their physical properties
What are ions?
Ions are charged particles.
They form when atoms lose or gain electrons
What is the atomic radius?
Half the diameter of an atom
