0
Group No = No.of valence electrons in the outer configuration period No = principle quantum No.(n)of the last shell of outer configuration Eg:carbon EC=1s2 2s2 2p2 No.of valence electrons=4, indicates G.No.is IV n=2, indicates period No. is 2 chlorine EC=3s2 3p5 valence electrons=7,so G.No. is VII n=3,so period No is 3
Ashlee Farrell
Add your answer:
Earn +20 pts
What are elements in the first group of period table called?
alkali metals
How does the numbers of electrons change across a period of elements?
The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).
How did Mendeleev predict the existence of unnatural elements?
He left blank spaces in the periodic table in the correct grouping and period that is where the newly discovered elements were placed.
Which group of the main group elements contains the largest elements - Atomic Radius?
Group-1 has largest atomic radius. It decreases across a period
Is a family of elements also known as a period of elements?
No, on the periodic table of elements a family is a group of elements that are in the same row.Answered by Faustin Obedi
How do you predict an elements group?
they have same numbers of electrons.
What are elements in the first group of period table called?
alkali metals
How many Group 17 elements are in Period 3 of the Periodic Table?
Group 17 elements (Halogens)Fluorine- Period 2Chlorine- Period 3Bromine-Period 4Iodine- Period 5Astatine- Period 6Ununseptium-Period 7There is 1 element from Group 17 that is part of Period 3.
How many group 17 elements are in periodic 3 of the periodic table?
Group 17 elements (Halogens)Fluorine- Period 2Chlorine- Period 3Bromine-Period 4Iodine- Period 5Astatine- Period 6Ununseptium-Period 7There is 1 element from Group 17 that is part of Period 3.
What element is in group 4 and period 2 on the periodic table?
Group 4 elements on the periodic table contain no period 2 elements whatsoever.
How does the number of valence electrons for elements across a period?
The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).
How does the numbers of electrons change across a period of elements?
The number of valence electrons for the elements increases across a period, from 1 (group 1) to 8 (group 18).
What is the difference3 between a family of elements and elements in the same period?
a family is a column of elements a period is a row of elements
How did Mendeleev predict the existence of unnatural elements?
He left blank spaces in the periodic table in the correct grouping and period that is where the newly discovered elements were placed.
Which group of the main group elements contains the largest elements - Atomic Radius?
Group-1 has largest atomic radius. It decreases across a period
How many elements are there in the third period of the periodic table?
There are 8 elements in the third period of periodic table. The elements belong to group-1,2,13,14,15,16,17 and 18
Are elements with similar chemical properties found in the same period or group on the periodic?
Elements with same properties are present in same group. They are not present in same period. For example- alkali metals are present in same group.
