In the modern periodic table, the period indicates the value of
Principal quantum number
Azimuthal quantum number
Why Does Period 5 Have 18 Elements?
Total number of orbitals in a shell is given by _____.
The atomic numbers of three elements A, B and C are 3, 9 and 11 respectively. State which of the two elements will exhibit similar chemical properties.
Elements A, B and C have atomic numbers 9, 20 and 10 respectively.
State which one is
(1) a non-metal,
(2) a metal,
(3) chemically inert
[Rn] 5f14 6d1 7s2 7p4 , group 3
[Rn] 5f14 7s2 7p5 , group 7
[Rn] 5f14 6d2 7s2 7p3 , group 15
[Rn] 5f14 6d5 7s2 , group 7
The atom having the number of electron shell as 4 and valence electrons as 2 belongs to
Group 13 and period 4
Group 14 and period 3
Group 3 and period 4
Group 4 and period 3
Reference to the long form of the periodic table fills in the blanks with appropriate words.
The______elements are accommodated in the middle of the periodic table.
The last subshell of an element is 3p and there are 3 electrons in it.
(a) Write the complete electron configuration of the element.(b) Identify its period and group.
What are periods?
The atomic number of elements X, Y and Z are (A -2), A and (A + 2), respectively. Y is a noble gas (not helium) then predict the group to which X, Y, and Z belong and also predict the formula of a molecule formed by X and Z?
- diagonal rows
- individual elements
- horizontal rows
(a) Identify the Group number of the element with atomic number 14.
(b) Identify the Periods of these elements in the Periodic Table.
(c) What would be the electronic configuration for element with atomic number 20?
(d) Determine the valency of the element with atomic number 7.
P - (2, 2)
Q - (2, 8, 2)
R - (2, 8, 5)
S - (2, 5)
Which of the following options is correct?
- P and Q belong to second period and R and S belong to third period.
- P and R belong to second period and Q and S belong to third period.
- S and Q belong to second period and R and P belong to third period.
- P and S belong to second period and R and Q belong to third period.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect
- groups, periods
- periods, groups
- coloumn, row
Zeff decreases from top to bottom
- =Screening Constant
Zeff increases from top to bottom
Zeff increases as we move from left to right in the Periodic table
An element has an electronic configuration 2, 8, 7. It belongs to the _________________.
17th group & 2nd period
7th group & 3rd period
3rd group & 7th period
17th group & 3rd period
Give the information conveyed by the symbol .
All elements in 3rd period have
An atomic number 3
3 complete sub-shells
Valence electrons shell
3 electrons less than the octet