Where is most of the mass of the atom found?
In the nucleus because the protons and neutrons are the heaviest part of the atoms.
Term given to the electric charge on the nucleus. It is found by counting the number of protons. It will always be a positive number since protons have a positive charge.
An atom whose overall charge in neutral. It has an equal number of protons and electrons.
Where can the number of protons (atomic number) be found on the periodic table?
It is the number found in the left hand corner for each element.
What is the name of a column in the periodic table?
Group or Family. The families are also numbered1 to 18. Each family in the period table has similar properties.
Where are Metals found on the periodic table?
On the left side and the middle of the periodic table.
Where are the metalloids on the periodic table?
Form a stair case toward the right side of the periodic table.
What are some family names in the periodic table?
Alkaline earth metals
What are the alkali metals?
Group 1 in the periodic table (excluding hydrogen). the are very reactive metals
What are the alkaline earth metals?
Group 2 in the periodic table. The are somewhat reactive metals.
What are the noble gases?
They are group 18 in the periodic table. They are very unreactive gaseous non-metals.
How do you figure out the charge on an atom when it becomes an ion?
There is a number the periodic table that has a + or - beside it that tells you the charge of the ion. For example Aluminum will lose 3 electrons and become an atom with a charge of 3+ (Al 3+). Look at the periodic table.
Some metals are multivalent, which means they can form ions in more than one way depending on the chemical reaction. For example Titanium (Ti) can form a Ti4+ ion or a Ti3+ ion.
What is a Bohr diagram?
A Bohr diagram is a diagram that shows the number of electrons in each shell surrounding the nucleus of an atom.
How many electrons can fit in the first 3 shells of a Bohr diagram?
2 electrons, 8 electrons, 8 electrons.
How can you use the periodic table to find out the number of electron shells that surround the nucleus of an atom?
The period number (row number) of an element equals the number of shells in the atom. For example Hydrogen is in row 1, so it has 1 shell. Sodium is in row 3 so it has 3 shells.