How does the atomic radius change as you go 3 Mark I from left to right in a period II down a group in the periodic table?
(a) (i) Atomic radius decreases. (ii) Atomic radius increases. The period number of an element is equal to the number of electron shells in its atom. These two elements have 3 electron shells, therefore they belong to 3rd period.
How do atomic radius vary in a period and in a group How do you explain the variation?
Answer: In general, the atomic radius decreases as we move from left to right in a period with an increase in nuclear charge of the element. The atomic radius increases when we go down a group because of the addition of extra shell.
How does the atomic number change as you go from left to right?
Experiments have shown that the first case is what happens: the increase in nuclear charge overcomes the repulsion between the additional electrons in the valence level. Therefore, the size of atoms decreases as one moves across a period from left to right in the periodic table.
How do you think the tendency to lose electrons will change in a group?
Tendency of an element to lose electrons increases when we go down the group. This is because atomic size increases when we go down the group. And force of attraction of nucleus for the valence electrons decreases down the group.
How does the tendency to lose electrons change as we go down in Group 1 of the periodic table why does it change this way?
As we go down in group 1, one more electron shell is added at every stage and the size of the atom increases. The valence electrons become more and more away from the nucleus and hold of the nucleus on valence electrons decreases.
How does the tendency to gain electrons change as we move across a period in the modern periodic table?
As we move from left to right across a period in the periodic table, the tendency to gain electron increases. On moving from left to right across a period in the periodic table, there is an increase in the nuclear charge of the elements. Hence, the tendency to gain electrons increases.
How does the tendency of an element to lose electrons change in the modern periodic table?
How does the tendency of the elements to lose electrons change in the Modern Periodic Table in. (ii) The tendency to lose electrons decreases along a period since the electrons are filled in the same shell i.e., valence shell. Their attraction towards the nucleus increases due to decrease in atomic size.
How does the tendency of the elements to lose electrons change in the modern periodic table in a group and period and why?
How does the tendency of the elements to lose electrons change in the Modern Periodic Table in. (ii) The tendency to lose electrons decreases along a period since the electrons are filled in the same shell i.e., valence shell.
How does tendency to accept electrons varies in group and period?
Ans. (i) Tendency to gain electrons decreases on moving down a group because with increase in size, the electrostatic force of attraction between the nucleus and valence electron decreases and hence, valence shell electron are losely bounded. Elements of same group have same number of valence electrons.
What is the gain of electrons called?
The loss of electrons is called oxidation. The gain of electrons is called reduction. As such, electron-transfer reactions are also called oxidation-reduction reactions, or simply redox reactions. The atom that loses electrons is oxidized, and the atom that gains electrons is reduced.
What are elements that lose electrons and form positive ions called?
Metals tend to lose electrons and form positively charged ions called cations. Non-metals tend to gain electrons and form negatively charged ions called anions.
What is the tendency of electron?
i.e., it is a measure of the relative tendency to undergo oxidation (loss of electrons) or reduction (gain of electrons). M→Mn++ne- (oxidation potential) Mn++ne-→M (reduction potential).
What happens to tendency to gain electrons in a period?
Tendency to gain electrons increases as we go from left to right in a period because the effective nuclear charge increases and the atomic radius decreases.
How will this tendency change in a period?
a) The tendency to lose electrons decreases from left to right across the periods. This is because the number of valence electrons goes on increasing from left to right across the period. So, the nuclear force to hold the valence electrons decreases and the tendency to lose the valence electrons increases.
How does the Valency vary in a period?
Answer: The valency of an element is dependent on the number of electrons in the outermost shell of the electron. In a group all constituting elements will have the same valency because they all have the same number of electrons in the outer shells. Across the a period, the number however increase by 1.
Why do you think Valency across a period first increases and then decreases?
Valency is defined as the number of electrons present in the valence shell. After 14th group, the valency decreases because the valency is counted as how many electrons are needed to get the octet configuration. That is why first valency increases across a period and then decreases.
Why Valency decreases across a period?
On moving across a period the number of electrons increases but as the valence electrons crosses 4 it is easier for elements to accept electrons. So the valency decreases.
Why does metallic character decreases across a period?
Across a Period: Metallic character decreases from left to right across each Period of the Table as the outer electrons experience increasing effective nuclear charge and thus require more energy for their removal. Down a Group. (b) Metallic character increases down a Group.