Atomic size decreases across a period as the effective nuclear charge increases. Atomic size increases down a group as the energy level (shells) increases.
Atomic size increase down the group and decreases across the period.
7th period because atomic size down the group increases. And Alkali Earth metals are found only in Group 1. The element is in Group 1 and period 7
The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).
The properties which change regulary from top to bottom in a group and from leaft to right a period are called periodic property.
The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).
Ionization energy increases as you go across a period, but as you go down a group it decreases.
Carbon is in group 14, period 2
ur question was whyhorse change size of bodyist tell me is size of your body remains same from the period of your chilhood,not at allwith the passage of time changes occours so now i hope you will understand why horse change size of body
Nitrogen is period 2, group 15. sodium is period 3 group 1, iodine is period5 group 17. mercury is period 6 group 12.
In the periodic table, the atomic size increases with every period due to addition of an extra shell. The atomic size decreases with every group since no. of electrons and protons are increased with every group across a period leading to extra electrostatic force of attraction between electrons and the nucleus and thus shrinking the size of the atom.
Atomic size generally decreases as you move across a period from left to right due to increasing effective nuclear charge. However, atomic size tends to increase as you move down a group due to the addition of more electron shells.
nitrogen- group 15; period 2 sodium- group 1; period 3 iodine- group 17; period 5 mercury- group 12; period 6