Tell whether it is an example of an element or a compound. Write the word element if the sample shows characteristics of an element and compound if it shows Characteristic of compound 11. Aluminum
12. Mercury
13. Ferrous Sulfate
14. Sucrose
15. Carbon

Element- Aluminum

Element - Mercury

Compound - Ferrous Sulfate

Compound - Sucrose

Element - Carbon

Explanation:

Element: an element is a pure substance which is composed of only one type of atoms and that cannot be split or broken down into any simpler pure substance.

Examples of elements include:

Aluminum - it is composed of only atoms of aluminium. Each atom has 13 protons

Mercury - it is composed of only atoms of mercury. Each atom has 80 protons

Carbon - it is composed of only atoms of carbon. Each atom has 6 protons

Compound: a compound is a pure substance that is composed of two or more types of atoms (elements) in a fixed and definite proportion and that cannot be split into component elements by simple physical methods but only by chemical methods. Examples of compound include:

Ferrous sulphate: It is composed of atoms of Iron, Sulfur and Oxygen

Sucrose: It is composed of atoms of Carbon, Hydrogen and Oxygen.

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."