Y9 Chemistry - Atomic structure, Chemical bonding and Properties of Matter
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22 Terms
Definition of atom?
All substances are made of atoms. An atom is the smallest part of an element that can exist.
What are atoms of each element represented by?
a unique chemical symbol
How many types of atom does each element contain ?
only 1
Are molecules metal or non metal?
Non metal
Are molecules all or some non metals?
Some
How to tell whether an element is an atom or a molecule?
Subscripted number, eg 2
How are compounds formed?
From elements by chemical reaction
Compound definition?
A compound contains 2 or more elements bonded together in fixed proportions.
How are compounds represented
They can be represented by formulae using the symbol from the atoms from which they were formed, eg NaCl - sodium chloride
In which ways can chemical reactions be written?
Word or symbol equations
What is true of the first letter in Element symbols?
The first letter is always capital.
What is the radius of an atom?
Very small, 0.1 nanometres (10^-10)
What is the radius of an atomic nucleus?
Less than 1/10000 of that of an atom (10^-14)
What is the overall electric charge of an atom?
Neutral, because protons = electrons
Do atoms of different elements have different amounts of protons?
Yes, and same for electrons and neutrons.
What is the atomic number?
Number of protons = number of electrons.
What is the mass number?
Number of protons + neutrons in the nucleus
What is an isotope?
An element that has a different relative atomic mass due to a different number of neutrons.
Definition of relative atomic mass?
Relative atomic mass is the number of protons and neutrons in the nucleus of all thé isotopes in an element compared to Carbon
Why is relative atomic mass compared with Carbon-12?
Because Carbon-12 is the standard atom.
Where are the protons, neutrons and electrons?
The protons and neutrons are in the nucleus, the electrons orbit in shells.
Which force keeps the electrons orbiting the atom?
Positives and Negatives attract