Atom size increases down a group because there is an increase in the number of shells so the attraction between electrons and protons decreases. Atom size decreases across a period because the number of protons increases meaning that there is more attraction between the protons and electrons therefore drawing the outer shells closer to the nucleus.
Answer:
11.31 g.
Explanation:
Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.
M = (no. of moles of solute)/(V of the solution (L)).
<em>∴ M = (mass/molar mass)of NaCl/(V of the solution (L)).</em>
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<em>∴ mass of NaCl remained after evaporation of water = (M)(V of the solution (L))(molar mass)</em> = (0.45 M)(0.43 L)(58.44 g/mol) = <em>11.31 g.</em>
The periodic table was arranged by Mendeleev in the increasing order of atomic numbers. The arrangement sees to it that the elements belonging to the same column has similar properties and the rows are arranged in increasing number of valence electrons. The answer here is true.
Explanation:
magnetic separation is used for the iron fillings and sodium chloride
The iron fillings will stick to the magnet
then evaporation can help to remove water
