Made from zinc and copper, brass has been manufactured for thousands of years. it is used in weapons, pipes, musical instruments, and many other important ways. which of these words best describes brass?

a) alloy
b) compound
c) element
d) molecule

The correct answer is option A.

Explanation:

Alloy: An alloy is defined as homogeneous substance composed of two different or more than two different metals. Brass is one alloys made from zinc and copper metal.

Where as compound is a substance made up two or more different elements.

Element is the purest substance which contains atoms of only one kind.

Molecule is the group of atoms of same kind or different kind.

Hence, the correct answer is option A.

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.