9SCIE - Graph rules + Atoms

What does CUTLASS stand for?

crosses, units, title, label, axes, smooth curve or straight line, size

How to write a graph title?

graph of y axis variable against x axis variable

Element

made of only one type of atom

Atomic number

number of protons in an atom

Mass number

number of protons and neutrons in an atom

Valence shell

the outer most shell of an atom

Valence electron

electrons found in the outer most shell of an atom

Nucleus

central part of an atom that contains the protons and neutrons

Electron

negatively charged subatomic particle

Proton

positively charged subatomic particle

Neutron

Neutral subatomic particle

What is the mass number of neutrons and protons?

1

What is the mass number of electrons?

almost no mass

State how many electrons are in each shell of an atom

2, 8, 8, 2

What does the last digit of the group number tell us?

the number of valence electrons

What does the period of an element tell us?

how many electron shells it has