basic knowledge of periodic table Flashcards
1
Q
periods
A
rows, show the number of shells in the atom.
2
Q
groups
A
columns, show the number of electrons in the valence shell.
3
Q
what is the electron configuration for the first 20 elements
A
2, 8, 8
4
Q
what is the electron configuration after the first 20 elements
A
2, 8, 18, 32, full valence shell is still 8.
5
Q
what are reactants and products
A
reactants are the starting substances before the chemical reaction occurs, products are the substances that form after the chemical reaction.
