Select the factors that lead to the production of a high-energy bremsstrahlung (brems) x-ray when a filament (projectile) electron interacts with an anode tungsten atom (select the four that apply) A The filament electron passes far away from the nucleus of a tungsten atom. B The filament electron travels close to the nucleus of a tungsten atom. C The nuclear electrostatic field creates a strong force of attraction on the passing filament electron. D The nuclear electrostatic field creates a weak force of attraction on the passing filament electron. E The filament electron arrives at the anode with high kinetic energy. F The filament electron arrives at the anode with low kinetic energy. G The atomic number of the tungsten atom is high. H The atomic number of the tungsten atom is low.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-