What is the general trend followed while filling of electrons across a period in the modern periodic table.

Correct option is  B) 6th

Elements present in the first period i.e., H and He contain only one shell which is also their valence shell and can accommodate maximum two electrons. As first shell can accommodate only...

Hydrogen (H) : 1s2, Helium (He) : 2s2 Since helium has a complete duplet i.e., two electrons in its valence shell, it has the stable complete electronic configuration.

i. Filling of electrons in the second period: In the second period, electrons are filled in the second shell i.e., n = 2. This shell can accommodate a maximum of eight electrons...

The fourth period corresponds to the filling of fourth shell, n = 4. Therefore, it begins with filling of 4s subshell. The first two elements of the fourth period are K...

The fifth period accommodates 18 elements as a result of successive filling of electrons in the 5s, 4d and 5p subshells.

i. First period  ii. f-Block

i. Across a period: a. As we move across a period from left to right in the periodic table, the effective nuclear charge increases steadily. b. Hence, due to the increase in...

The Modern periodic table removed various anomalies of Mendeleev’s periodic table as follows:  i. All isotopes of the same element have different atomic masses but same atomic number. Therefore, they occupy...

Correct Answer - D It is a fact.