Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

The atomic number of an element A is 40. What are the group number, period and block of the element?
Asked by Topperlearning User | 27 Jun, 2016, 11:01: AM
answered-by-expert Expert Answer

The electronic configuration of the element with atomic number 40 is:

40X: 1s2, 2s2, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d2
Since the last electron enters d sub shell, the element belongs to d- block.
Since the outermost shell of the element is fifth, the element belongs to period 5
Group number of the elements of d-block is equal to sum of the electrons in outermost s-sub shell and d-sub shell of penultimate shell.
Hence, group number of the element = 2 + 2 = 4. 
Answered by | 27 Jun, 2016, 01:01: PM
CBSE 11-science - Chemistry
Asked by akhilshrivallibrundapallavi123 | 06 Nov, 2020, 07:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Bhuvana.sethumadhavan | 18 May, 2020, 02:29: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by kumarm2793 | 24 Feb, 2020, 03:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by kewal | 01 Sep, 2019, 11:44: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by karisinmusic | 31 May, 2019, 11:39: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Topperlearning User | 14 Aug, 2014, 01:35: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Topperlearning User | 14 Aug, 2014, 03:31: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Chemistry
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×