4. Make a rule: Based on your data, how are elements arranged into chemical families? 5. Infer: Look at your periodic table. How many valence electrons would you find for elements
in each family?
Boron family:
Carbon family:
Neon family:
6. Think and discuss: How do you think the number of valence electrons relates to an
element's chemical properties?

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:

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)