Periodic Table
Which subatomic particle or particles contribute the most to the mass of an atom?
protons and neutrons
What is an isotope?
When the atom has a different number of neutrons than protons.
What do the periods on the periodic table represent?
The number of electron shells.
What is an ion?
When an atom gains or loses electrons.
How do you figure out the number of neutrons?
Subtract the protons from the atomic mass
How many neutrons are in Nitrogen - 17
The mass is 17. There are 7 protons so therefore there are 10 neutrons.
What do the groups on the periodic table represent?
The number of valence electrons.
What is the difference between a cation and an anion?
A cation has a positive charge and an anion has a negative charge.
How many neutrons are in Oxygen - 17
17 is the mass, there are 8 protons so 9 neutrons
Which group is most reactive? And, which element in that group is the most reactive?
Group 1, Fr
What is the charge when there is 7 protons and 10 electrons?
3-
What doe the term energy levels mean?
It is the number of electron shells.
If the atomic mass is 17 and the number of protons is 10, what is the number of neutrons?
7 neutrons
Which group is considered the noble gases?
What is the charge when there is 12 protons and 10 electrons?
2+
What does the term 'valence electrons' mean?
number of electrons on outermost shell
An element with a mass number of 15 and an atomic number of 7 has how many neutrons?
8
What period and group is sodium?
period 3, group 1
If an element gains 4 electrons, what kind of charge will it be?
Anion