Atomic structure

23<- mass NG 11 <- atomic # How many neutrons ?

(23-11) = 12 neutrons To find neutrons, subtract the mass from the atomic #

4 He. How many P, E, & N? 2

2 protons, 2 electrons, 2 neutrons ( 4-2)

A neutron has a charge & a mass of?

A neutron has a charge of 0 and a mass of 1.0 AMU ( atomic mass unit)

An electron has a charge & mass of?

Electron= -1 ( e-) charge & no mass 0 AMU ( atomic mass unit)

Atoms can be broken down into which smaller particles?

Electrons, protons & neutrons

What is an isotope?

Elements with the same atomic number but different mass numbers

Atomic number of an element

Is the number of protons in that element

The nucleus is made out of electrons, neutrons or protons?

It's made out of protons and neutrons

The mass of an atom is stored where?

Nucleus

Mass number = ?

Number of protons + number of neutrons

A proton has a charge & a mass of ?

Proton= 1+ charge & 1.0 AMU ( atomic mass unit)

The nucleus has a charge of what?

The Nucleus has a positive charge bc it has a proton in it

Atomic rate =

The average weight of the isotopes of an element

If there are 8 protons in the nucleus, how many electrons are on the outside?

There are 8 electrons on the outside

What else can we conclude from the atomic number, besides its protons?

We can conclude the number of electrons also