Chemistry Chapter 2

subatomic particles from least to greatest mass

electron, proton = neutron

what is the mass number

protons + neutrons

atomic number is where on the periodic table?

top left

atomic number is equal to what?

number of protons

How do you find the total number of neutrons in an isotope

Mass number - number of protons

how do you find the number of electrons in an isotope?

number of protons - the charge

How do you know if and element is neutral?

if the number of protons and electrons are equal

what is the mass number

protons + neutrons

how do you find the charge of an element?

atomic number - electrons

what are elements with a different number of neutrons called?

Isotopes

columns going from left to right in the periodic table

groups

rows going from top to bottom on the periodic table

periods

elements in the same period all share the same what

number of energy shells

What is group 1’s family of metals(-hydrogen, very reactive)

Alkali Metals

what metals are in group 2 on periodic tables(vairly reactive)

alkaline earth metals

what is an ion

atoms or groups of atoms with a positive or negative charge

what forms a cation

removing electrons giving it a positive charge

what forms an anion

adding electrons giving it a negative charge

generally, metals

lose electrons, forming cations

generally, nonmetals

gain electrons, forming anions