Respuesta :

nkirotedoreen46

Answer:

Atomic radius increases from top to bottom in Groups 1 and 2

Explanation:

First we need to define Atomic radius;

  • Atomic radius is the distance from the nucleus of an atom to the outermost energy level.
  • Group I and Group II of the periodic table are made up of alkali and alkaline-earth metal respectively.

Second, we identify the trend in the number of energy levels down the group

  • As you move down the group from top to the bottom, the number of energy levels of elements increases.
  • For example, Lithium which is higher in group I has 2 energy levels while potassium which is lower in the group has three energy levels.

Third, we answer our question.

  • Therefore, the atomic radius increases from top to the bottom of a group due to an increase in the number of energy levels.

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