Please help i need this today at 2:30

1st truee 2nd D

Explanation:

democratus proposed that matter made up of indivisible particles he named it Atomos in lattin language

which is our atom now

photons have verver small mass

so they considered particles

in the same time the have wave properties

thats why it is said that their nature is dual nature

just like electrons

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.