Answercan you upload the pictures??
Explanation:
Molar mass NaOH = 39.997 g/mol
number of moles:
n = mass of solute / molar mass
n = 10.0 / 39.997
n = 0.2500 moles
Therefore:
Molarity = moles of solute / volume ( L )
M = 0.2500 / 2.0
M = 0.13 mol/L
Answer B
The best answer would be answer B. "the atom has a cloud of positive charge....."
The atomic size / radius generally increases, as when we move down the group, it means that there is an additional shell compared to the last element. For example, K has one more electron shell than Na does, so the atomic size generally increases as we move down a group in the periodic table.
