DEFINITIONS
Define atom
Smallest unit of matter
Define ion
An atom with a charge due to the loss or gain of electrons
Define electron configuration
The summary of where the electrons are around a nucleus
What does the atomic number represent?
Number of protons (or electrons)
What element is in Period 3 Group 3
Aluminium
Define element
An atom/s of a single type
State the charge on ions from Group 5 on the Periodic Table
+3
State the electron configuration for Silicon
2, 8, 4
What does Mass Number represent
Number of protons + neutrons
What is the charge on an atom?
Neutral
Define compound
When two or more chemical elements are chemically bonded together
How many electrons does Oxygen need to gain to become stable
2
State the element that has an electron configuration of 2, 8, 8, 1
Potassium
What does period number represent?
Number of electron shells
Identify which of the following is an ionic compound:
NaCl
Li2O
N2
NaCl and Li2O
Define mixture
A substance made up of two or more different substances which are not chemically combined
A Lithium atom has the symbol Li. A Lithium ion has the symbol Li+1. Explain how a Lithium atom differs from a Lithium ion
Lithium ion has less electrons
State the electron configuration of a Magnesium ion
2, 8
How do you calculate the number of neutrons an element has?
Mass number - Atomic number
In what way is an atom similar to a molecule of an ionic compound?
The overall charge is zero
Define molecule
Two or more atoms of the same or different element element that are bound together
Explain why Noble gases do not form ions
They are stable as atoms
The electron configuration of the following elements are:
A - 2, 8, 1
B - 2, 8, 2
C - 2, 8, 8, 3
D - 2, 8, 8, 2
Which elements are in the same group?
B and D
Why do elements belong in the same group?
Same number of valence electrons
Same properties (act the same)
CH4 is a compound.
How many atoms are present in 4 molecules of CH4
20