Groups of the Table
The elements in group 1 are known as __?
alkali metals
The mass number of an element shows __.
The number of protons plus neutrons
How do you know an atom is neutral?
It has the exact same number of positive protons and negative electrons.
How do you find the number of energy levels/orbitals?
Look at the period (row) number?
What are the elements in group 2 known as and how many electrons are in the outer energy level?
alkaline earth metals, and two valence electrons in the outer shell
The atomic number of an element shows ___.
the number of protons OR electrons
Which element has 3 electron shells and 12 protons?
Magnesium
Which family needs 3 more valence electrons to have the same as noble gases?
Nitrogen family
If I know the atomic number...then I also know______ and _______?
If I know the atomic number, then I also know the number of protons and the number of electrons of a neutral atom.
What are the columns called on periodic table?
Groups or families
1.What state of matter is Neon at room temperature?
2.What state of matter is Bromine at room temperature?
1.gas
2. liquid
I am the largest section on the periodic table. What am I? (nonmetals, metalloids, or metals)
metals
Elements found between metals and nonmetals outlined in orange are called?
metalloids
If an atom has 7 protons and 8 neutrons, what is the mass number?
What is 15?
What are the elements in group 17 called and how many electrons are in the outer energy level?
halogens, and 7 electrons in the outer shell
What is the name for the group 18 nonmetals?
Noble Gases
Which of these elements is the most unreactive and why?
Sodium, Gold, Sulfur, Krypton, Hydrogen
Krypton because it has a full outer shell of electrons.
When an atom has more or less neutrons it is called.....
Isotope
Which member of the Boron group has the lowest atomic number?
Boron with an atomic number of 5
What are the elements in group 8A or 18 called and why are they considered relatively unreactive?
They are noble gases and have full outer energy levels.
Elements #57-#70 are known as ___ and elements #89-#102 are known as ____.
1.Lanthanides
2.Actinides?
I have 61 neutrons and 47 protons. Which element am I?
Silver
Which group on the periodic table is unreactive (has all valence electrons paired up)?
Group 8 (noble gases)
How many outermost electrons Tin and Carbon have?
4 valence electrons