18) Define periodic law or periodicity. ANSWER ON ATTACHED SHEETS 19) What is th

Question

18) Define periodic law or periodicity. ANSWER ON ATTACHED SHEETS 19) What is th e mass, in grams, of a single atom of the element that is named for the founder of the dern periodic table? yOu MUST SHOW YOUR WORK ON ATTACHED SHEETS PLACE ANSWER HERE 20-21) Write the name and the symbol for the metalloid in the fifth period having six valence electrons. 20) PLACE NAME HERE 21) PLACE SYMBOL HERE How many elements are gasses at room temperature and pressure? PLACE ANSWER HERE 23) How many valence electrons are in an atom of the element found in the fourth period in IVA? PLACE ANSWER HERE onfiguration for the element chlorine, whose atomic number i c. 1s 2s 2p3 1 192s 2p9

Explanation / Answer

19)

Mendelevium is the element

Its symbol is Md

molar mass of Md = 258.0 g/mol

This is mass of 6.022*10^23 atoms

we have below equation to be used:

mass of 1 atom = molar mass /(6.022*10^23)

mass of 1 atom = 258.0/(6.022*10^23)

mass of 1 atom = 4.28*10^-22 g

Answer: 4.28*10^-22 g

Feel free to comment below if you have any doubts or if this answer do not work. I will correct it and submit again if you let me know

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