basic knowledge of periodic table Flashcards

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1
Q

periods

A

rows, show the number of shells in the atom.

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2
Q

groups

A

columns, show the number of electrons in the valence shell.

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3
Q

what is the electron configuration for the first 20 elements

A

2, 8, 8

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4
Q

what is the electron configuration after the first 20 elements

A

2, 8, 18, 32, full valence shell is still 8.

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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.

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