The first premise of Atomic Theory states that all elements are made up of these.
What are atoms
100
An element's atomic number represents this
What is the number of PROTONS
100
In the periodic table, elements are put into these two groups
What are metals and nonmetals
100
1 mole equals this many particles
What is 602,213,670,000,000,000,000,000
(6.02 X 10^23)
100
When an atom loses or gains electrons, it becomes this
What is an ION
200
Most of an atom is this
What is empty space
200
Horizontal rows (<---->) on the periodic table are called this
What are periods
200
The most reactive group of metals are these.
What are the alkali metals (Group 1)
200
1 mole of zinc has this many zinc atoms
What is 602,213,670,000,000,000,000,000
(6.02 X 10^23)
200
When the number of neutrons is not the same as the number of protons, you have this
What is an ISOTOPE
300
The three main subatomic particles that atoms are made of
What are protons, neutrons, and electrons
300
Vertical (up-and-down) columns on the periodic table are called this
What are groups
300
Non-metallic elements, such as arsenic, that have some properties of metals are known as ___________
What are semi-conductors
300
The molar mass of 1 mole of zinc
What is 65.39 grams
300
an ion with a positive charge is called this
What is a cation
400
The reason why atoms have no charge
What is because the have the same number of electrons (negatively charged) and protons (positively charged) so the negative and positive cancel each other out
400
Elements in the same GROUP have the same number of these
What are valance electrons
400
The nobel gases are found in this group
What is group 18
400
2.5 moles of sulfur has a mass of ___________
What is 80 grams
400
an ion with a negative charge is called this
What is an anion
500
# of protons + # of neutrons = _________
What is amu (atom's mass)
500
Elements in the same PERIOD have the same number of these
What are electron shells
500
All elements with an atomic number greater than _____ are man-made; they do not occur naturally
What is 92
500
20 grams of Helium = _________ moles of helium
What is 5
500
The electrons on the outermost (last) electron shell are called ___________ electrons