atomic structure Flashcards
1
Q
what is an atom?
A
the smallest particles of an element that consists of electrons surrounding a nucleus which contains protons and neutrons
2
Q
what is a molecule?
A
a group of 2 or more atoms chemically joined together
3
Q
relative mass and charge on proton?
A
1 and 1+
4
Q
relative mass and charge on neutron?
A
1 and 0
5
Q
relative mass and charge on electron?
A
1/1840 and -1
6
Q
what is the atomic number?
A
the number of protons in the nucleus of the atom
7
Q
what is the mass number?
A
the sum of the number of protons and neutrons in the nucleus of the atom
8
Q
what are isotopes?
A
atoms of the elements containing the same number of protons but a different number of neutrons- same atomic number, diff mass number
9
Q
what is the relative atomic mass?
A
weighted average mass of one atom of an element
