give the trend in atomic size on moving across the period left to right
Answers
Explanation:
Moving Across a Period
Moving from left to right across a period, the atomic radius decreases. The nucleus of the atom gains protons moving from left to right, increasing the positive charge of the nucleus and increasing the attractive force of the nucleus upon the electrons. True, electrons are also added as the elements move from left to right across a period, but these electrons reside in the same energy shell and do not offer increased shielding.
Moving Down a Group
The atomic radius increases moving down a group. Once again protons are added moving down a group, but so are new energy shells of electrons. The new energy shells provide shielding, allowing the valence electrons to experience only a minimal amount of the protons' positive charge.
Answer:
As we move left to right ina period of modern periodic table the atomic size of element decreases.
Explanation:
It is because as we move left to right ina period of modern periodic table the nuclear charge of elememt icreases so the shells shrinks as a result atomic size decrases