100 points and you

below is a bohr model of an element with 11 protons, 12 neutrons, and 11 electrons.

#16 identify the symbol of the element. be sure to write the symbol in proper format. *

#17 what is the mass number of the element? (example: 35) *

#18 write the electron configuration for this element. (do not use the carrot ^ or commas , example: 1s2 2s2 etc) *

#19 this bohr model is representing an atom, not an ion. explain how you would know. *

#20 if this atom were to lose one electron, would it become a cation or an anion? explain. *

#21 would the ionic radius of this element be larger or smaller than that of the atomic radius? explain. *

16. 11 protons means its atomic number is 11 so the element is ₁₁Na

17. mass number = sum of protons n neutrons = 11+12 = 23

18. 11 electrons means the configuration is 1s2 2s8 3s1

19. its an atom, not an ion cuz' no. of electrons = no. of protons so it is neutral n not charged

20. losing 1 e- will make Na +ve charge so it becomes a cation

the grams   of   barium that   are in   2.3 x 10^23   atoms of barium   is   52.4 g (answer c)

    calculation

mass = moles   of ba   x molar   mass of ba

  molar mass of ba from periodic table=   137.3 g/mol

  use the   avogadro's law   constant   to   calculate the moles of barium

  that   is     1 mole =   6.02   x 10^23 atoms

                    ? moles = 2.3 x 10^23   atoms

by cross   multiplication

=(1 mole   x 2.3x 10^23 atoms)   / 6.02   x10^23 atoms)=   0.382   moles

mass   is therefore = 137.3   g/mol x 0.382 mol = 52.4 ( answer c)

explanation: