Atomic Number
Hydrogen is the most abundant element in the universe. The atomic number of hydrogen is:
What is 1.
Meals are likely gain or lose electrons?
What is the atomic mass of hydrogen?
1.0
What element has 3 energy levels and 1 valence electrons?
K
How many energy levels does fluorine have?
2
Another important element is carbon, found in all organic molecules. How many protons are in an atom of carbon?
6
A negatively charged ion is one that has more protons than electrons? True or False.
False.
How do you calculate the atomic mass of an element?
Add the # of protons with the # of neutrons.
What are the horizontal rows on the periodic table called?
periods
How many valence electrons does aluminum have?
3!
How many electrons does Oxygen2- have?
10.
What is the ionic form of Sulfur?
S2-
What is the atomic mass of oxygen?
16.0
What would be the formula for a compound between potassium and nitrogen?
Hint: COMPOUND requires the positive and negative charges to add up to equal zero.
K3N
What is the periodic trend for energy levels? How to energy levels change across the periodic table?
They increase going down the periodic table
70% of air is nitrogen. Ionized nitrogen produces green and violet aurora colors. Do you know its atomic number?
7
If the oxygen ion is to return to the oxygen atom, it must gain or lose two electrons?
Lose
The majority of the atomic mass is in ____?
Nucleus
What would be the chemical formula for a compound between aluminum and oxygen?
Hint: COMPOUND requires the positive and negative charges to add up to equal zero.
Al2O3
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
Fluorine is the first halogen. Pure fluorine is a corrosive yellow gas. Do you know its atomic number?
9
Why would an element/atom loses or gains an electron?
Being stable.
An element which atomic mass = 28.1, number of protons = 14, what is the number of neutrons?
14
Which one has a large atomic size?
P or Ca?
Ca
List 3 metals that have similar reactivity to calcium.
Be, Mg, Sr, Ba, Ra