Which of the Which of the following is NOT a type of crystal structure? A. Ionic B. Metallic C. None of these D. Macromolecular (giant covalent)e following is NOT a type of crystal structure?

None of these

Explanation:

A crystal structure refers to a regular, unique pattern if atom arrangement that characterizes a particular solid material. A crystal structure comprises of a unit cell, the unit cell refers to a regular arrangement of atoms in a particular pattern; this pattern is periodically repeated in the three dimensional structure of the lattice.

Many substances in nature such as minerals, metals, covalent network solid macromolecules and ionic substances are arranged in crystal structures. All the substance categories listen among the options possess definite crystal structures arranged in unit cells. None of them is a noncrystalline substance, hence the answer above.

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.