Does it increase or decrease when you move down a group on the periodic table?

Explanation: Electronegativity is defined as the ability of an atom to gain electrons in order to become stable. When we move downwards in a group then there will be increase in size of atom. Thus, we can conclude that elements change as you move down a column in a periodic table as the electronegativity decreases.

What happens to the reactivity when you go down a group on the periodic table?

As we go down the group, the atom gets bigger. The bigger the atom, the further away the last electron. Therefore, the attraction between the nucleus and the last electron gets weaker. This makes it easier for the atom to give up the electron which increases its reactivity.

Does Zeff increase down a group?

Going down a group, distance and shielding increase. Effective Nuclear Charge (Zeff) remains constant. Ionization energy decreases going down a group. Going down a group, distance and shielding increase.

Why is Group 1 more reactive as you go down?

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.

Why does Group 7 get less reactive?

Reactivity decreases down the group. This is because group 7 elements react by gaining an electron. As you move down the group, the amount of electron shielding increases, meaning that the electron is less attracted to the nucleus.

Is Zeff the same in a group?

Atomic Radius The distance from the center of the atom to the valence electrons of the atom increases going down a group. The size of the atom increases going down a group. Going down a group, distance and shielding increase. Effective Nuclear Charge (Zeff) remains constant.

Why is Zeff constant down a group?

Across a period, effective nuclear charge increases as electron shielding remains constant. Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital.

Why does atomic size increase as you move down a group?

Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

What is the most reactive element in Group 7?

Fluorine
Fluorine is the most reactive element of all in Group 7. You can see the trend in reactivity if you react the halogens with iron wool.

What is the least reactive element in Group 7?

Revision notes on the topic ‘Group 7: Reactivity’ for Edexcel IGCSE Chemistry

• Reactivity of Group 7 non-metals increases as you go up the group.
• Out of the 3 halogens, chlorine, bromine and Iodine, chlorine is the most reactive and iodine is the least reactive.

When do we go down in a group in periodic table?

Decreases. The periodic table tendency for effective nuclear charge: Increase across a period (due to increasing nuclear charge with no accompanying increase in shielding effect). Decrease down a group (although nuclear charge increases down a group, shielding effect more than counters its effect).

What happens to electrons as they move down the periodic table?

The greater attraction between the increased number of protons (increased nuclear charge) and electrons, pulls the electrons closer together, hence the smaller size. As you move down a group in the periodic table, the covalent radius increases.

How does atomic size vary across and down the periodic table?

How does atomic size vary across and down the periodic table for main group or representative elements? For main group elements, atomic size gets larger as you go down a group (column) and atomic size gets smaller as you go across a period (row). Let’s use the following condensed periodic table to show the relative sizes of the main group elements.

When do we go down in a group?

Decrease down a group (although nuclear charge increases down a group, shielding effect more than counters its effect). Was this answer helpful?

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