Ethene is a product of cracking. Relative formula mass (M) of ethene = 28
Calculate the number of moles of ethene (C2H4) in 50.4 kg
Give your answer in standard form.

The element that has the greatest electronegativity is

What metric units would you use to measure the thickness of a key

As we move from left to right across the periodic table, what is the general trend? a) atomic radii increase. b) electronegavitiy decreases. c) nuclear shielding increases. d) metallic character decreases.