The graph shown could represent which of these? a) a book released from a height with the dotted line representing potential energy and the solid line representing kinetic energy. b) a book released from a height with the dotted line representing kinetic energy and the solid line representing potential energy. c) a pendulum released from a height with the dotted line representing potential energy and the solid line representing kinetic energy. d) a pendulum released from a height with the dotted line representing kinetic energy and the solid line representing potential energy.

C: A pendulum released from a height with the dotted line representing potential energy and the solid line representing kinetic energy.

Explanation

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.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.