Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.

Academic Chemistry NCERT Class 10

A belongs to Group 13, B belongs to Group 14 and C belongs to Group 2.

The valency of A is 3, that of B is 4 and that of C is 2.

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

7 Views

Name :(a) three elements that have a single electron in their outermost shells.(b) two elements that have two electrons in their outermost shells.(c) three elements with filled outermost shells.
(a) Name three elements that have a single electron in their outermost shells.(b) Name two elements that have two electrons in their outermost shells. (c) Name three elements with completely filled outermost shells.
Which of the following statement (s) about the Modern Periodic Table are incorrectThe elements in the Modern Periodic Table are arranged based on their decreasing atomic numberThe elements in the Modern Periodic Table are arranged based on their increasing atomic massesIsotopes are placed in adjoining group (s) in the Periodic TableThe elements in the Modern Periodic Table are arranged based on their increasing atomic number(a) (i) only(b) (i), (ii) and (iii)(c) (i), (ii) and (iv) (d) (iv) only
The electrons in the atoms of four elements A, B, C and D are distributed in three shells having 1, 3, 5 and 7, electrons respectively in their outermost shells. Write the group numbers in which these elements are placed in the Modem Periodic Table. Write the electronic configuration of the atoms of B and D, and the molecular formula of the compound formed when B and D combine.
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.(i) Which two elements belong to the same group? (ii) Which two elements belong to the same period? Give reasons for your choice.
Given below are some elements of the modern periodic table. Atomic number of the element is given in parentheses. A (4), B (9), C (14), D(19), E(20)(a) Select the element that has one electron in the outermost shell. Also, write the electronic configuration of this element.(b) Which two elements amongst these belong to the same group? Give reasons for your answer.(c) Which two elements amongst these belong to the same period? Which one of the two has bigger atomic radius?
Total number of non-metal in the modern periodic table with their name.
Given below are some elements of the modern periodic table: 4Be, 9Fe, 14Si, 19K, 20Cai. Select the element that has one electron in the outermost shell and write its electronic configuration.ii. Select two elements that belong to the same group. Give reasons for your answer.iii. Select two elements that belong to the same period. Which one of the two has bigger atomic size?
(a) What is the usual number of valence electrons and valency of group 18 elements of the periodic table?(b) What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
Consider the following elements:Na, Ca, Al, K, Mg, Li (a) Which of these elements belong to the same period of the periodic table? (b) Which of these elements belong to the same group of the periodic table?
The elements A, B, and C belong to groups 1, 14, and 17 respectively of the Periodic Table. Which two elements will form ionic compounds?A and BA and CB and CNone
Halogens belong to group ____________ of the Periodic Table.
Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.
In the following diagram for the first three periods of the periodic table, five elements have been represented by the letters a, b, c, d and e (which are not their chemical symbols):
The elements A, B and C belong to groups 1, 14 and 17 respectively of the periodic table.(a) Which two elements will form a covalent compound?(b) Which two elements will form an ionic compound?

Kickstart Your Career

Get certified by completing the course

Get Started

Advertisements