The Periodic Table Flashcards
(7 cards)
What is the symbol for Magnesium?
Mg
All of the elements in a group have what?
The same number of electrons in their outer shell
How many electrons does helium have?
Two
What does the top number of a symbol mean?
Mass number, the total number of protons and neutrons
What does the bottom number of a symbol mean?
Atomic number, the number of protons which also tells you the number of electrons
How do you find the number of neutrons in an atom?
Subtract the atomic number from the mass number
Which side of the periodic table are metals?
The left side under Boron