Periodic Table and Trends Flashcard

Front

Valence electrons are...

Back

the number of electrons on the outermost energy shell of an atom.

Front

Why did Mendeleev leave gaps in his periodic table?

Back

He predicted a then unknown element would fit there.

Front

Which element is most likely to have six valence electrons?

Back

Oxygen (O).

Front

What is the name of Groups 3-12 in the periodic table?

Back

Transition Metals.

Front

What is the name for the bottom two rows of the periodic table that have been removed?

Back

Lanthanides and Actinides.

Front

What are the main groups of the periodic table?

Back

Alkali Metals, Alkaline Earth Metals, Transition Metals, Halogens, Noble Gases.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What trend is observed in atomic radius across a period?

Back

Atomic radius decreases from left to right across a period.

Front

What trend is observed in electronegativity down a group?

Back

Electronegativity decreases as you move down a group.

Front

What are noble gases known for?

Back

They are known for being inert and having a full valence shell.