Atomic Number
Mass Number
Atomic Mass
Miscellaneous
Trends
100
Hydrogen is the most abundant element in the universe. The atomic number of hydrogen is:
What is 1.
100
An atom has 15 protons and 16 neutrons. What is the mass number (rounded)?
What is 31.
100
What is the atomic mass of hydrogen?
What is 1.00.
100
What element has 5 energy levels and 4 valence electrons?
Sn - Tin
100
How many energy levels does fluorine have?
2
200
Another important element is carbon, found in all organic molecules. How many protons are in an atom of carbon?
What is 6
200
What is the mass number of this nucleus?
What is 7.
200
How do you calculate the atomic mass of an element?
What is add the # of protons with the # of neutrons.
200
What are the horizontal rows on the periodic table called?
periods
200
How many valence electrons does aluminum have?
3!
300
How many electrons does Oxygen have?
What is 10.
300
What 2 particles must be added together to find the mass number of an element?
Add protons and neutrons together
300
What is the atomic mass of oxygen?
What is 15.99.
300
What are all of the subatomic particles, and their charges?
Protons = positive
Electrons = negative
Neutrons = neutral
300
What is the periodic trend for energy levels? How to energy levels change across the periodic table?
They increase going down the periodic table
400
70% of air is nitrogen. Ionized nitrogen produces green and violet aurora colors. Do you know its atomic number?
What is 7.
400
An atom has mass number 23 and atomic number 11. How many protons, electrons and neutrons are present in the atom?
11 protons, 11 electrons, 12 neutrons.
400
What happens to the atomic mass when electrons are added to a compound?
Nothing!
400
Who proposed the first atomic theory?
Democritus
400
What is the periodic trend for valence electrons? How does the number of valence electrons change from left to right?
Valence electrons increase from left to right
500
What is the atomic number of lead?
What is 82.
500
What particle count can you find if the atomic number of an element is subtracted from the mass number?
What is the number of neutrons.
500
How many neutrons does carbon have?
Carbon has 6 neutrons
500
Challenge: How many atoms are in the molecule MgCl2?
3
500
List 3 metals that have similar reactivity to calcium.
Be, Mg, Sr, Ba, Ra