Periodic Table and Reactivity Flashcard

Front

What characteristic of sodium (Na) is responsible for its high reactivity?

Back

Sodium has one valence electron.

Front

What do we call a horizontal row of elements in the periodic table?

Back

A horizontal row of elements is called a Period.

Front

Atoms with the same number of electrons in their outer shell are in the same ____?

Back

Group.

Front

Which element has the atomic number 1?

Back

Hydrogen.

Front

What is a Group in the periodic table?

Back

A Group is a column of elements that have similar properties and the same number of valence electrons.

Front

What is a Period in the periodic table?

Back

A Period is a row of elements that have the same number of electron shells.

Front

What is the significance of valence electrons in chemical reactivity?

Back

Valence electrons determine how an element will react with others; elements with fewer valence electrons tend to be more reactive.

Front

Which two elements are in the same Group: Sodium (Na) and Potassium (K)?

Back

Yes, Sodium and Potassium are in the same Group (Group 1).

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

How does the reactivity of metals change across a Period?

Back

Reactivity of metals decreases across a Period from left to right.