Sodium (Na) has an atomic number of 11.

Group 17 elements, also known as halogens, commonly exhibit an oxidation state of -1.

Ionization energy generally increases across a period due to increasing nuclear charge.

The element with atomic number 20 is Calcium, which is in period 4.

Electronegativity increases across a period from left to right.

Atomic radius increases down a group due to the addition of electron shells.

Electronegativity increases from left to right across a period.

Metallic character decreases from left to right across a period.

Alkali metals are found in Group 1 of the periodic table.

Halogens are located in Group 17 of the periodic table.

Noble gases are found in Group 18 of the periodic table.

Carbon has the highest first ionization energy among the given elements.

Carbon has a larger first ionization energy compared to the other elements listed.

K+ has the largest ionic radius among the given options.

Fluorine has the smallest atomic radius among the given elements.

Fluorine is a halogen, found in Group 17 of the periodic table.

Boron is classified as a metalloid in the periodic table.

Helium is a noble gas, located in Group 18 of the periodic table.

Zinc is classified as a transition metal.

Fluorine is a halogen and is found in Group 17 of the periodic table.

Potassium is an alkali metal and typically forms a +1 ion.

Sodium is an alkali metal and readily loses an electron to form a cation.

Magnesium has the highest first ionization energy among the given elements.