Elements occurring in the same period share similar reactivity. Groups or famili

Question

Elements occurring in the same period share similar reactivity. Groups or families of elements have the same number of valence elec Metalloids have mixed properties between those of metals and nonm Most of the solid elements in the periodic table are metals. When most elements in the periodic table are arranged by mass, cert properties recur periodically. An element that only forms ions of 2+ charge can be found among the __ the periodic table: metals nonmetals metalloids rare earth elements It depends on the element. In general, as you go across a period in the periodic table from left to ri The atomic radius ___ The electronegativity ___; and The first ionization energy ___. Decreases, decreases, increases increases, increases, decreases increases, increases, increases, decreases, increases, increases, decreases, increases, decreases

Explanation / Answer

26)
Li has 2s1
Na has 3s1
K has 4s1
Rb has 5s1
Cs has 6s1
Answer: K

27)
group 2 elements forms ions of only +2 charge
group 2 is metal
Answer: A

28)
Atomic radius decreases because, no extra shell is getting added but nuclear attraction is increasing due to added protons
The electronegativity decreases
The 1st ionization energy increases
Answer: A

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