1. Which of the following is the definition given in class as the definition of a model * (1 Point)
Something small that represents something large, like a toy car.
Something scientists make to run an experiment
Something scientists make to answer questions about the real world
A job a person can get where they show off clothes

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.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )