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Subject: Chemistry, asked on 29/1/19

Why is potassium more reactive than lithium

Subject: Chemistry, asked on 17/1/19

A radioactive element which exist in the form of two isotopes. What is the answer. Plzz ans

Subject: Chemistry, asked on 10/12/18

Name an element of group 18 which can form compound.

Subject: Chemistry, asked on 21/11/18

Element of group 1 and group 17 both have valency 1. Explain.

Subject: Chemistry, asked on 25/10/18

If the valency of the elements is the same as their group number, then what should be the valency of the elements lying in group 8 ?

Subject: Chemistry, asked on 8/10/18

Please explain the concept of transition and inner transition elements ?

Subject: Chemistry, asked on 8/10/18

In groups 2 and 17 in the periodic table , the difference in atomic numbers of the elements is 8, 8, 18, 18, 32. What does the term 'difference in atomic numbers of elements' mean?

Subject: Chemistry, asked on 16/9/18

State the valency of elements in Group 1(IA)

Subject: Chemistry, asked on 14/9/18

What is the common feature of the electronic configuration of the elements at the end of period 2 and period 3?

Subject: Chemistry, asked on 16/8/18

Write the chemical formula showing the steps
1) calcium sulphate

Subject: Chemistry, asked on 6/3/18

Please solve the 13 th problem. 
Please do not provide any link.

13. According to atomic structure, what determines which element will be the first and which will be the last in a period? ​
 

Subject: Chemistry, asked on 1/2/18


Q. Sodium and aluminium have atomic numbers 11 and 13 respectively. They are separated by one element in the periodic table, and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19, respectively) and yet both have valency 1. Explain.

Subject: Chemistry, asked on 1/2/18



Q. Sodium and aluminium have atomic numbers 11 and 13 respectively. They are separated by one element in the periodic table, and have valencies 1 and 3 respectively. Chlorine and potassium are also separated by one element in the periodic table (their atomic numbers being 17 and 19 respectively) and yet both have valency 1. Explain.

Q. Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common.

Q. In which part of a group would you separately expect the elements to have:
a) the greatest metallic character?
b) the largest atomic size?

Q. What happens to number of valence electrons in atoms of elements as we go down a group of the periodic table?

Subject: Chemistry, asked on 3/8/20

Abhi bhai gussa h muzse...?

Subject: Chemistry, asked on 3/7/19

Name the metalloid in period 2and 3

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