Period – reactivity decreases as you go from left to right across a period . The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity. ... Group – reactivity decreases as you go down the group.
Why chemical reactivity first decreases and then increases in a period?
Along a period, the alkali metals and halogens are the most reactive. ... Thus, as we move along a period the tendency to lose electron decreases for the metals and tendency to gain electron increases for the non-metals. Consequently, the reactivity first decreases then increases.
Why does the reactivity increase down a group?
The reactivity of group 1 elements increases as you go down the group because: the atoms become larger . the outer electron becomes further from the nucleus . the force of attraction between the nucleus and the outer electron decreases .
What is the reactivity of non metal when its size increases?
While moving from top to bottom in a group of the periodic table, the reactivity of non- metals decreases . While moving from top to bottom in a group of non- metals, the atomic size increases with the additional number of shells and the force of attraction between the nucleus and valence shell decreases.
Why does chemical reactivity increase from top to bottom?
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 reactivity increase down a period?
Period – reactivity decreases as you go from left to right across a period. The farther to the left and down the periodic chart you go, the easier it is for electrons to be given or taken away, resulting in higher reactivity.
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.
Does reactivity increase down a Group 2?
The reactivity of the group 2 elements increase as you go down the group . This is because, as explained previously, it is much easier to remove an outer shell electron as you go further down the group (lower ionisation energies).
How does size affect reactivity?
The larger an atom is , the more reactive it will be. It helps to think about the size of an atom with the location of the electrons and nucleus in mind. ... If electrons can leave more easily, then the atom is more likely to react.
Which is more reactive fluorine or chlorine?
Electronegativity is probably the biggest thing that plays into reactivity. Therefore, since fluorine has a higher electronegatvity than chlorine, fluorine is more reactive.
Why chlorine is a very reactive non metal?
Chlorine atoms have a lot of valance electrons without being complete on its own, so it has a greater need to seek it’s conjugates. That’s called Electronegativity. Halogens are highly reactive because of their electronegativity .
Which is less reactive mg or Zn Why?
Exploring the Activity Series Chart
This shows magnesium is more reactive than zinc and both metals are more reactive than hydrogen. This third displacement reaction can be used for any metal that appears lower than itself on the table. The further apart the two metals appear, the more vigorous the reaction.
Which is the least reactive metal?
Platinum is the least reactive of all the options. Aluminium, iron are also formed in combined forms in the natural surroundings.
What happens to reactivity down the group 17?
The chemical reactivity of group 17 elements decreases down the group. So down the group there is an increase in the atomic radius and hence the effective nuclear force decrease as the atomic radius increases and this leads to the decreased chemical reactivity down the group.
How can you tell if an element is reactive?
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Which of the following elements is the least reactive?
Chemical Properties of Noble Gases
Noble gases are the least reactive of all known elements. That’s because with eight valence electrons, their outer energy levels are full.
