Subatomic particles
the smallest piece of matter that still retains the properties of the element
atom
what is the abbreviation of an element called
chemical symbol
what are the rows of the periodic table called
periods
isotopes are atoms of the same element with different numbers of...
neutrons/mass number
this element has 1 proton
hydrogen
what are the 3 subatomic particles and their charges
protons - positive
neutrons - neutral/no charge
electrons - negative
the sum pf protons and neutrons
mass number or atomic mass
this shows how many electrons an element has in its outermost energy level
Lewis Dot Structure
the weighted-average mass of all isotopes of an element
average atomic mass
The chemical symbol of this element is S
Sulfur
what area of the atom has mass and is positively charged
nucleus
an illustration of an atom’s energy levels and electrons
Bohr Model
How many electrons fit on energy level 3
up to 8 electrons
what does the number in the isotope names represent
What is the chemical symbol for Chlorine
Cl
what is the overall charge of an atom with 3 protons and 4 electrons
negative
what is the name of the group with the least reactive elements
Nobel Gases
what elements touch the stair step line on the periodic table
metalloids (except aluminium)
how many neutrons are in Lithium-6
3 neutrons
The chemical element of this element is Na
Sodium
name and describe the 3 forces that hold an atom together
attractive forces between (+) nucleus/protons and (-) electron cloud/electrons
repulsive forces between (+) protons and (+) protons
repulsive forces between (-) electrons and (-) electrons
What does group 14 all have in common
4 valence electrons
on the second E-level of a Bohr model, how do you place the electrons
Start at 3 o'clock and then place them counterclockwise (3, 12, 9, 6)
how many neutrons are in Calcium-42
22 neutrons
this element is the only noble gas that does not have 8 valence eleectrons
Helium