Which of the following statements is not accurate in regard to the first four energy levels? a. the first energy level has 1 p orbital. b. the third energy level can hold a maximum of 18 electrons. c. the fourth energy level is the only energy level to hold an f sublevel. d. an orbital can hold a maximum of two electrons.

A. The first energy level has 1 p orbital.

Explanation:

The energy levels of the atom or electronic layers as they are also known, refer to the layers occupied by the electrons that revolve around the atom's nucleus. Each of these levels can be determined by a number from 1 to 7 or uppercase letters, represented in the alphabet by the letters K through Q.

So far, in all known atoms, electrons can occupy up to seven energy levels, represented respectively by the capital letters K, L, M, N, O, P and Q or by the numbers 1, 2, 3, 4. , 5, 6 and 7. The number of occupied energy layers (or energy levels) varies according to the amount of electrons in each atom, as can be seen in the next topic: electronic distribution. The first energy level has 1 s orbital

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:

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.