ii) Write the formula of the compound formed by A and B.
Answers
Answer:
The atomic numbers of three elements X, Y and Z are 3, 11 and 17 respectively. State giving reason which two elements will show similar chemical properties. (2013 OD)
Answer:
Elements Atomic Number Electronic configuration
X 3 2, 1
Y 11 2, 8, 1
Z 17 2, 8, 7
X & Y will show similar chemical properties as both elements have same number of valence electrons, i.e., 1.
Question 7.
The atomic numbers of three elements A, B and C are 11,17 and 19 respectively. State giving reason which two elements will show similar chemical properties. (2013 OD)
Answer:
Elements Atomic Number Electronic configuration
A 11 2, 8, 1
B 17 2, 8, 7
C 19 2, 8, 8, 1
A and C will show similar chemical properties as both elements have the same number of valence electrons, i.e., 1.
Question 8.
Write any one difference in the electronic configurations of group 1 and group 2 elements? (2014 D)
Answer:
Elements of group 1 have one electron in their outermost shell.
Elements of group 2 have two electrons in their outermost shell.
Explanation:
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