Question

Which statement is CORRECT regarding the trend for atoms getting larger?

a
As atoms get larger, the number of valence electrons will decrease.
b
As atoms lose electrons, they tend to decrease in size.
c
As atoms get larger, the coulombic forces between the inner electrons and the nucleus get weaker.
d
As atoms get larger, their atomic number tends to increase, such as Sodium and Potassium.

Answer 1

The size of the atoms of increases across a period and down a group

The correct statement regarding the trend for atoms getting larger is the option d.

• d. As atoms get larger, their atomic number tends to increases, such as Sodium and Potassium

Reason:

Analysis of each option is as follows;

• Option a; The valence electrons are the electrons in the outermost shell of the atom, and it is dependent on the group of the atom rather than the size.

• Option b; The number of electrons an atom loses depends on the amount of valence electrons it has and does not affect the size of the atom appreciably.

• Option c; The coulombic forces is the attraction between the nucleus and the electrons and the coulombic forces between the nucleus and the outer get weaker as the atom gets larger. However the inner electrons will have strong coulombic forces acting on them.

However;

• Option d; As atoms get larger, the number of electrons they contain increases and therefore, the number of protons, which gives their atomic number, also increases.

Therefore; the correct option is; as atoms get larger, their atomic number tends to increases, such as Sodium and Potassium

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