Period – reactivity increases as you go from the left to the right. Group – reactivity decreases as you go down the group.
Why does metal reactivity decrease down a period?
Chemical reactivity of the elements – definition 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.
What happens to the metallic character when we go down the group?
As we move down the group, the number of shells increases. The effective nuclear charge experienced by valence electrons decreases because the outermost electrons move farther away from the nucleus. Therefore, these valance electrons can be lost easily. Hence, metallic character increases down the group.
How do you know when an element is more 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. Alkali metals are highly reactive because they readily lose the single electron in their outermost shell.
Which of the following is the most reactive metal?
Caesium, the most reactive metal in the periodic table, reacts extremely violently – hence why it can’t be demonstrated in a classroom! This can be compared to other common metals, such as iron and copper, which produce no reaction when dropped into water.
How does metallic character increases?
The metallic character increases as you go down a group. Since the ionization energy decreases going down a group (or increases going up a group), the increased ability for metals lower in a group to lose electrons makes them more reactive.
Why are some metals more active than others?
Lithium, sodium, and potassium all react with water, for example. The rate of this reaction increases as we go down this column, however, because these elements become more active as they become more metallic. The metals are often divided into four classes on the basis of their activity, as shown in the table below.
What happens when metals are exposed to oxygen?
Metals tend to readily lose electrons and form cations. Most of them react with atmospheric oxygen to form metal oxides. However, different metals have different reactivities towards oxygen (unreactive metals such as gold and platinum do not readily form oxides when exposed to air).
Why does the rate of reaction increase as metals become more metallic?
The rate of this reaction increases as we go down this column, however, because these elements become more active as they become more metallic. The metals are often divided into four classes on the basis of their activity, as shown in the table below.
How are Group 1 metals react with water?
The group 1 elements are all soft, reactive metals with low melting points. They react with water to produce an alkaline metal hydroxide solution and hydrogen. Reactivity increases down the group.