physical science chapter 15 test review

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protons, neutrons, and electrons

An atom is composed of subatomic particles called

electrons

These are shared or exchanged when molecules form

neutrons

elements have the same number of protons as

periodic tables are organized by

protons or atomic number

what is atomic mass?

the number of protons

how many elements are known?

100

what do electrons attract?

protons

each elements have the same

protons

what has the largest mass in a atom?

neutron

Atomic mass isnt a whole number due to differences in neutrons or

isotopes

you can change an atom to a different one by

adding or subtracting protons

if you add one proton and one neutron to chlorine, you have

argon

if you subtract two protons and two neutrons from oxygen, you have

carbon

list the layers of shells in atoms

2,8,8,18

This was formed by using the outer electron shell of the atom

lewis dot diagram

atoms from your body come from other things says

scientists

the hydrogen atom has _ electron,_proton, and _ neutrons

1,1,0

what are two examples of noble elements?

neon and helium

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