Why is this not an isomer of hexane?

BEZ IT THE structure of the HEXANE ITSELF

OTHERS R THE ISOMER OF THIS STRUCTURE.

AND THIS STRUCTURE DON'T CONTAIN A CARBON WITH LESS THAN 2 HYDROGEN ATOMS WHICH R COMPULSORY FOR A STRUCTURE TO BE A ISOMER

Hydrogen, helium, neon. electronegativity means ability to attract electrons.

helium, & neon do not need anymore electron. they are in column 8. Hydrogen is in column 1 but it depends on what it is reacting with to gain  or lose an electron.

3,4,5,6,7,8,9,10  electronegativity increases

As you go down a group the electronegativity decreases