How reactive is an atom of sodium(na) and why? question 1 options: sodium (na) is not very reactive because it does not have a full valence shell. sodium (na) is not very reactive because it can only bond with chlorine (cl) to become salt. sodium (na) is very reactive because it does not have a full valence shell. sodium (na) is very reactive because it does not have enough protons in the nucleus.

The correct reason for reactivity of sodium is it does not have a full valence shell.

Further explanation:

Reactivity is defined as the tendency of the element to lose or gain an electron.

The reactivity trend of metals in periodic table:

Across a period, the energy level remains same while the number of electrons increases. This causes an increase in nuclear charge of the atom. Therefore electrons are strongly held by the nuclear forces. As a result, the reactivity of metals decreases from left to right.

Down the groups, the energy level increases while the number of electrons remains same. This causes a decrease in nuclear charge of the atom. Therefore electrons are loosely held by the nuclear forces. As a result the reactivity of metals increases from top to bottom.

All the alkali metals and alkali earth metals have extra electrons which can be donated easily to attain the noble gas configuration. The reason for noble gas has high stability is its complete octet or fully filled valence shell. Due to stability they rarely react with other elements.

In case of sodium (Na), the ground state electronic configuration is,

To attain the noble gas configuration or fully-filled valence shell sodium easily donate it last 3s electron and get the noble gas configuration of neon.

Therefore, sodium is very reactive because it does not have a full valence shell.

Learn more:

1. Determine the ion that represented by electronic configuration

2. Determine the reason that causes water molecule a bent shape.:

Answer details:

Grade: Senior school

Subject: Chemistry

Chapter: S-block elements

Keywords: Periodic table, reactivity, metal reactivity, sodium, more reactive metal, valance electron, electronic configuration.

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).