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.

Three elements having 7 electrons in their outermost shell

Three elements having 7 electrons in their outermost shell

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 in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of A and D and the molecular formula of the compound formed when A and D combine.

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 in their outermost shell respectively. State one period in which these elements can be placed in the Modern Periodic Table. Write the electronic configuration of the atoms A and D and molecular formula of the compound when A and D combine.

Three elements having a single electron in their outermost shell .

The atomic numbers of three elements A, B and C are 11, 13 and 19 respectively. Explain which two of the elements will belong to the same group of the periodic table.

There are 7 electrons in the outermost 'L' shell of an element. Predict the period and group in the periodic table this element belongs to.

An element with atomic number 5 belongs to III A group of the modern periodic table. Find the number of valence electrons