7th Grade Science - Atomic Model

If you add one proton to an atom, what happens to the net charge?

+1

If you add one electron to an atom, what happens to the net charge?

-1

If there are more protons than electrons...

...it's a + (positive) ion.

If there are more electrons than protons...

...it's a - (negative) ion.

If there are an equal number of protons and electrons...

...it's a neutral atom.

How many mass units does each electron add?

0 amu

How many electrons can be held in the 3rd level electron orbital?

18

How many electrons can be held in the 1st level electron orbital?

2

How many electrons can be held in the 4th level electron orbital?

32

How many electrons can be held in the 2nd level electron orbital?

8

True or False? A germ is smaller than an atom.

False - A germ is not smaller than an atom.

True or False? A grain of sand is smaller than an atom.

False - A grain of sand is not smaller than an atom.

True or False? An atom is larger than a molecule.

False - An atom is not larger than a molecule.

True or False? Atoms are about the same size as dust.

False - Atoms are much smaller than dust.

True or False? You can see atoms with a microscope in science class.

False - You cannot see atoms with a classroom microscope.

True or False? You can see 1 molecule of salt or water with the naked eye.

False - You cannot see atoms with your eyes alone.

True or False? An atom is really really tiny.

True - An atom is really tiny.

True or False? Cells are bigger than an atom because they're made of atoms.

True - Cells are bigger than atoms.

Does adding protons to an atom change the mass?

Yes, the mass changes if you add a proton.

Does adding neutrons to an atom change the mass?

Yes, the mass changes if you add an neutron

periodic table

a list that shows the chemical elements arranged according to their properties

electron

a very small particle of matter that has a negative charge of electricity and that travels around the nucleus of an atom

neutron

a very small particle of matter that has no electrical charge and is part of the nucleus of all atoms except hydrogen atoms

proton

a very small particle of matter that is part of the nucleus of an atom and that has a positive electrical charge

charge

an amount of electricity

quark

an elementary particle and a fundamental constituent of matter

The smallest particle of an element that still retains the properties of (acts like) that element is the ______.

atom

How many mass units does each neutron add?

each neutron is 1 amu

How many mass units does each proton add?

each proton is 1 amu

Does adding electrons to an atom change the mass?

no

If you add one neutron to an atom, what happens to the net charge?

nothing

element

one of the basic substances that are made of atoms of only one kind and that cannot be separated by ordinary chemical means into simpler substances

Which atom part do you have to change to change which element something is?

proton

What are the 4 subatomic particles of an atom called?

proton, neutron, electron, quark

nucleus

the central part of an atom that is made up of protons and neutrons

electron structure

the distribution of electrons of an atom or molecule in atomic or molecular orbitals

atomic number

the number of protons found in the nucleus of an atom of that element, and therefore identical to the charge number of the nucleus

atomic mass

the protons and neutrons of the nucleus

atom

the smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule

matter

the thing that forms physical objects and occupies space

Atom is Greek for _____.

uncuttable