Unit 1 Review

Front

Which element in Period 2 has the greatest atomic radius?

Back

Lithium (Li) has the greatest atomic radius in Period 2.

Front

How many valence electrons are found in atoms of group 1?

Back

Atoms of group 1 have 1 valence electron.

Front

Which of the following elements has the smallest radius: Mg, Al, Si, K?

Back

Silicon (Si) has the smallest atomic radius among the given elements.

Front

What is the Lewis structure of a sodium ion?

Back

The Lewis structure of a sodium ion (Na⁺) shows no dots around the symbol, indicating it has lost its one valence electron.

Front

Anions are _______ that form ____________ ions and __________ electrons.

Back

Anions are nonmetals that form negative ions and gain electrons.

Front

What is atomic radius?

Back

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons.

Front

What trend does atomic radius follow in the periodic table?

Back

Atomic radius increases down a group and decreases across a period from left to right.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.

Front

What is the significance of valence electrons in chemical reactions?

Back

Valence electrons determine how an atom will bond with other atoms and its reactivity.

Front

What is the difference between cations and anions?

Back

Cations are positively charged ions formed by losing electrons, while anions are negatively charged ions formed by gaining electrons.