Admin Table of Contents
- 1 How does the reactivity of metals change as you travel from left to right across a period on the periodic table?
- 2 What happens to the radius as you move across a period?
- 3 What happened to the reactivity of the element from top to bottom part of the periodic table?
- 4 How does the atomic radius change as you go from left to right in a period?
How does the reactivity of metals change as you travel from left to right across a period on the periodic table?
Period – reactivity decreases as you go from left to right. Period – reactivity increases as you go from the left to the right. Group – reactivity decreases as you go down the group.
What happens to the reactivity of elements while moving from left to right of the periodic table?
As we move from top to bottom, the reactivity of metallic elements of Group IA increases. Since the atomic size of sodium is smaller than the atomic size of potassium, sodium has more force of attraction between the nucleus and valence shell than that of potassium….Reactivity of Metals and Non- Metals.
| Subshell | Maximum no. of Elements |
|---|---|
| s | 2 |
| p | 6 |
| d | 10 |
| f | 14 |
What happens to the reactivity of metals from left to the right in the periodic table Why?
On moving from left to right in a period of the periodic table, the chemical reactivity of the elements first decreases and then increases.
What happens to the radius as you move across a period?
In general, atomic radius decreases across a period and increases down a group. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius.
How does the reactivity change on moving down a group?
The reactivity of Group 1 elements increases as you go down the group because: the outer electron gets further from the nucleus as you go down the group. the attraction between the nucleus and outer electron gets weaker as you go down the group – so the electron is more easily lost.
What happens to the reactivity of nonmetals down a group?
Nonmetal reactivity decreases down a group because the nucleus’ ability to gain more valence electrons weakens due to more nuclear shielding. For Metals: the most reactive metals are those that can lose their valence electrons the most easily.
What happened to the reactivity of the element from top to bottom part of the periodic table?
Reactivity of Group 1 Elements The reactivity of alkali metals increases from the top to the bottom of the group, so lithium (Li) is the least reactive alkali metal and francium (Fr) is the most reactive. Because alkali metals are so reactive, they are found in nature only in combination with other elements.
How do the following change on going from left to right in a period of the periodic table?
As we move from left to right in a period, the atomic number of elements increases which means that number of protons and electrons in the atom increases. Due to large positive charge on the nucleus, the electrons are pulled in more close to the nucleus and the size of the atom decreases.
What happens to atomic mass as you go left to right across the periodic table?
As you go from left to right in the Periodic Table, you are adding more protons and neutrons to the nuclei. The atoms in the rows further down have even more protons and nucleons. Therefore, atomic mass increases from left to right and from top to bottom of the Periodic Table.
How does the atomic radius change as you go from left to right in a period?
The atomic radius of atoms generally decreases from left to right across a period. The effect lessens as one moves further to the right in a period because of electron-electron repulsions that would otherwise cause the atom’s size to increase.
Why does reactivity decrease down group?
The reactivity of Group 7 elements decreases down the group. Non-metal atoms gain electrons when they react with metals. The electrons in the outer shell move further away from the nucleus as we go down the group and the attraction force between the electrons and the nucleus become weaker and weaker.