Question

Elements and Compoundsplease help me​

Answer 1

Answer:

An element is a substance that cannot be broken down into any other substance. made up or consisting of several parts or elements

Explanation:

Answer 2

Answer:

Question 1:

An element is a pure substance which cannot be broken down by chemical means.

Question 2:

A molecule is a group or cluster of two or more atoms held together by chemical bonds. A compound is a substance or material which is formed by two or more different types of elements which are combined chemically in a fixed proportion.

Question 3:

Electrons, Protons and Neutrons

Question 4:

Dmitri Mendeleev in 1869 developed the periodic table.