Question

Observe the part of given periodic table and answer the following part
Be
Mg
K Ca Sc
Which element has highest ionization energy
Write the elements in the order of decreasing order of their atomic size
Which element has highest metallic property
. ​

Answer 1

Answer:

1. Sc<Ca<K<Mg<Be

This  is the trend for ionization energy

2.Sc>Ca>K>Mg>Be

This  is the trend for atomic size

3.Sc<Ca<K<Mg<Be

This is the trend for metallic character

Answer 2

- Be element has highest ionization energy.

- The elements in the order of decreasing order of their atomic size are K > Ca > Sc > Mg > Be.

- K has highest metallic property.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

When we move across a period from left to right then there occurs a decrease in atomic size of the atoms. Therefore, ionization energy increases along a period.

For example, Be has highest ionization energy as compared to Be, Mg, K, and Ca.

When we move down a group then there occurs an increase in atomic size of the atoms due to addition of number of electrons in the atoms. But when we move across a period then atomic size decreases due to increase in attraction between the protons and electrons.

For example, atomic size of some elements is K > Ca > Sc > Mg > Be.

We know that elements of group 1 have the highest metallic character.

For example, potassium being group 1 element will have the highest metallic character.

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