1What to atoms contain?
Protons, neutrons and electrons
2What do electrons do?
Move around the nucleus in shells
3What kind of charge to electrons have?
Negative
4How much mass do electrons have?
virtually none
5why do electrons and protons cancel each other out?
charge in and electron is the same size as the charge in a proton so they cancel each other out
6Why do the protons and electrons in ions not cancel each other out?
the number of protons DOES NOT equal the number of electrons
7What charge does an atom have?
No charge- they are neutral
8what is the nucleus?
It is the structure in the middle of the atom that contains protons and neutrons. It has a positive charge and almost the whole of the mass of the atom is concentrated in the middle
9If there are 16 protons in an atom how many neutrons will there be and why?
16 because number of protons = number of neutrons in an atom
10What is an element?
a substance made up of atoms that all have the same no. of protons in their nucleus
11What is used to describe an atom?
Atomic number and Mass number
12Which number is the mass number?
top
13Which number is the atomic number?
bottom
14What is an Isotope?
Different forms of the same element but with the same number of protons and different number of neutrons. So they have the same atomic number but a different mass number.
15What must symbol equations be?
BALANCED
16What do atoms join together to make?
Compounds
17What is the definition of compound?
Substances that form from 2 or more elements that are held together by chemical bonds
18How do you calculate RELATIVE ATOMIC MASS?
(ISOTOPE ABUNDANCE x ISOTOPE MASS NUMBER)
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ABUNDANCE OF ALL THE ISOTOPES