Atom
Name all 3 subatomic particles.
Protons Neutrons Electrons
How many electrons are in the 3rd energy level?
18
How many periods are shown on the periodic table?
7
What is the formula for density?
Density = Mass/Volume (Mass over volume)
How are ions formed?
By losing or gaining valence electrons
What number do you use to find the number of protons?
atomic number
What is the 25th element called?
Manganese or Mn
What are the elements in Group 18 called ?
Noble Gases
What early model of the atom did Thomson develop that involved a lump of positive charge with electrons stuck to it?
Plum-Pudding Model
A negatively charged ion
Anion
When moving from left to right across the periodic table, what increases?
Atomic Number
What is the atomic number of neon (Ne)?
10
Fluorine, chlorine, bromine, and iodine belong to the family of ______________
halogens
Who performed the gold foil experiment?
Ernest Rutherford
What is a valence electron?
Electron in the outermost energy level
What is in the nucleus in the atom?
protons and neutrons
Which element has 3 protons, 3 electrons, and 4 neutrons?
Lithium
Group 2 is otherwise known as?
Alkali Earth Metals
Thompson used a cathode ray tube to discover which subatomic particle?
Electron
Elements in Group 2A form ions with a charge of ___
+ 2
The sum of protons and neutrons in the nucleus of an atom is known as the _________
Mass number
How many neutrons are there in a Calcium atom?
20
What exists along the staircase on the periodic table?
Metalloids
This person was the first to create a table that logically organized all the elements.
Dmitiri Mendeleev
Will oxygen accept or donate electrons? How many?
Accept two electrons