Request a call back

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

CBSE Class 10 Answered

How could we determine an element on the basis of given group and/or period ?
Asked by | 21 Feb, 2008, 07:23: PM
answered-by-expert Expert Answer

As per the modern periodic law the elements are arranged in increasing order of atomic number, and there are 18 groups and 7periods. There are 2 elements in 1 period, 8 each in 2 and 3 period, 18 each in 4 and 5 period 32 in 6 period and 7 period is in complete. Also rememember  1 group is called alkali metals, 2 is alkaline earth metals, 3 to 12 are called transition metals and 13 boron family,m 14 carbon family, 15 nitrogen family, 16 oxygen family, 17 halogens and 18 inert gas or nobel gases. Left side and bottom row elements are metals. Right hand side elements and top rows are nonmetals.  If the position in period and group is known the atomic number and element can be identifyied as metal or nonmetal.

For example element is present in 14 group and 2period. Count from left, 1 period has 2 elements--H and He, 3 period has 8 elements. Atomic number 3,4, 5, will be in 1, 2 and 13 groups. Atomic number of this element is 6 and it is carbon. the whole group is called carbon family.

Answered by | 07 Dec, 2017, 06:49: PM

Application Videos

CBSE 10 - Chemistry
Asked by dhumalchhaya13 | 26 May, 2022, 11:05: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by kanchanbalpande82 | 12 Apr, 2022, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by kanchanbalpande82 | 12 Apr, 2022, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by waghmaresheetal78 | 27 Dec, 2021, 05:02: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by vungtsaniyanthan | 16 May, 2021, 06:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by sinhagopalakumara | 01 May, 2021, 08:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by shettyshrinidhi271 | 07 Jan, 2021, 05:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Chemistry
Asked by adipadmakarri | 05 Dec, 2020, 06:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×