Characteristics of groups
|Nitrogen (N)||7||Non Metal|
|Phosphorous (P)||15||Non Metal|
The elements given in the table belong to VIIA. The reactivity of element decreases from top to the bottom due to increase in size of the atoms.
The name of the element is potassium.
Argon is an inert gas because it doesn't take part in chemical reaction due to octet state as it has already eight electrons in its outermost orbit.
Chlorine is an active non-metal because it has 7 electrons in its outermost orbit and has tendency to gain one electron from other atom during chemical reaction for the stability.
The two reasons of placing hydrogen are as follows:
The value of valency in a group is ______.
1 for all
0 for all
differ in all
same for all
The atomic radius of the element lying in a group ______.
may increase or decrease.
decreases from top to bottom.
remains same from top to bottom.
inceases from top to bottom.
The elements in each vertical column on the periodic table usually have similar properties and are called a ______.
The energy which is required to pull out the most loosely, held electron in an atom is ________.
In a group reactivity from top to bottom _______.