About how old is the sun? 1.2 billion years 4.6 billion years 6.4 billion years 8.2 billion years

4.6 billion years

Explanation:

The Sun is about 4.6 billion years old and would live for about 5 billion years more. The Sun was born in the Solar nebula 4.6 billion years ago. The molecular cloud of dust and gases accreted and collapsed and contracted under its own weight. The mass started spinning which eventually flattened into a disk. The core formed the Sun and from rest of the material, planets and other solar system bodies were formed.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."