Which elements are found only along a zigzag line that divides columns 13 through 18 on the periodic table? A. Metalloids
B. Metals
C. Nonmetals
D. Representative metals

A. Metalloids.

Explanation:

Metalloids. Metalloids, also called semiconductors, are the elements that border the zigzag line on the periodic table.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).