Definitions
What is an element
An element is a pure substance that has only one type of atoms. It cannot be broken down to anything simpler.
Compounds are pure substances
True
Which element does the diagram represent?
Magnesium
What is the mass number of an element?
It is the sum of the number protons and the number of neutrons in the nucleus of an atom.
Electrons are smaller than protons
True
Do Cat-ions have a positive or negative charge
Positive Charge
What is an atom?
The smallest particle of an element that consists of an electron surrounding a nucleus that contains protons and neutrons.
Electronic configuration is the is the arrangement of neutrons in orbitals around an atomic nucleus.
False, it is the arrangement of electrons in orbitals around an atomic nucleus.
The Nucleus of an atom is composed of ?
Protons and neutrons
What is an ion?
Ions are atoms or molecules with an electric charge due to the loss or gain of one or more electrons.
In Electronic configuration electrons in the same orbital move in the same direction.
False, electrons move in the opposite direction of each other in an orbital to avoid repulsion.
three orbitals
What is electronic configuration?
It is the arrangement of electrons in orbitals around an atomic nucleus.
All group 8 elements have 8 electrons in their outermost shell
Without using the periodic table what is the electron configuration of Oxygen
A.) 1s2 2s2 2p4
B.) 1s2 2s2 2p3
c.) 1s2 2s2 2p6
d.) 1s2 2s2 2p5
A.) 1s2 2s2 2p4