HELP! HELP Plz I give you brainliest if are correct 1)How is it possible to predict many of the properties of an element from the
knowledge of its atomic number?
(10 marks)
2)How is the electronic structure of an element related to each of the following?
(i) Its position in the periodic table (ii) Its valence(marks 05)

3)Consider the elements B, AI, C. and Si. Specify the element that has the:
(i) Most metallic character
(ii) Largest atomic radius
(ii) Largest electron affinity
(marks 06)​

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

What volume would 2.25 moles of ne has occupy at stp?