Science - Atoms, Ions, and Isotopes Study Guide

the smallest particle of matter

What is an atom?

atom

A ________is the lego blocks of hte universe.

92

There are _______natural atoms.

(1) neutron (2) proton (3) electron

Name the 3 subatomic particles.

1 amu / no charge

What is a neutron?

1 amu / positive charge

What is a proton?

no mass / charge

What is an electron?

ion

An _________ is an atom wiht charge that has either gained or lost electrons.

oxidation number

An _____________ is the number of electrons that is lost or gained.

lose

Ions become more positive when they __________ electrons.

gain

Ions become more negative when they _____________ electrons.

anion

A negative ion is a ___________.

cation

A positive ion is a ___________.

C with an exponent of 14 /C-14 / Carbon 14

Write the isotope of Carbon with the atomic mass of 14 in 3 different ways.

top left corner

Where do you find the atomic number?

bottom number

Where do you find the average atomic mass?

round the average atomic number or the isotope number if given

How do you find the mass number?

same as the atomic number found on the top left corner

How do you find the number of protons?

same as the atomic number unless its an ion

How do you find the number of electrons?

if its a negative add to the atomic number if its a postive subtract

How do you find the number of electron for ions?

the mass number subtracted from the number of protons

How do you find the number of neutrons?

average atomic mass

The __________is the average mass of all known isotopes of any atom.