The sodium atom loses an electron to form a sodium ion (na+). which statement is correct with respect to its atomic radius?

the sodium ion has a larger radius than the atom.

the sodium ion has a smaller radius than the atom.

the sodium ion and the sodium atom radii are the same size.

the sodium ion has twice the radius of the sodium atom.

The sodium ion has a smaller radius than the atom.

Explanation:

Atomic radii  is the distance from the center of the nucleus to the valence shell.

Sodium atom being neutral has 11 protons and 11 electrons.

Sodium ion has 10 electrons and 11 protons. Now 11 protons present in the nucleus can easily influence 10 electrons towards itself, the effective nuclear charge increases, the valence electrons are more tightly held by the nucleus and thus the size decreases.

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.