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
