Which of the following classifications is NOT correct?

(Chemistry Not Math Wrong Subject) - - Change Admin

Noble gases - 8 valence electrons

Halogens - 6 valence electrons

Transition metals - number of valence electrons varies

Alkali Rare Earth metals - 2 valence electrons

Halogens - 6 valence electrons

Step-by-step explanation:

Valence electrons are the number of electrons present in the outermost shell of the atom.

Noble gases have 8 valence electrons which is the maximum and are stable. They are inert by nature since they don't have to combine with any other element to attain stability.

Halogens have 7 valence electrons. They are high electronegative and have great attraction for electrons so that they can attain stability by forming the octet.

The valence electrons in transition metals varies as a group of columns are named transition metals.

Alkali earth metals has two valence electrons.

Hence the incorrect statement here is

Halogens - 6 valence electrons