Please help me!!ASAP

particle E and R

Explanation:

isotopes = atoms of same element with same proton number but different number of neutron

nucleon number = proton number + number of neutrons

particle E

- nucleon number = 16

- proton number = electron = 8

- number of neutrons = 16-8 = 8 ✅

particle Q

- nucleon number = 18

- proton number = electron = 9

- number of neutrons = 18-9 = 9

particles R^2-

- nucleon number = 18

- proton number = 10-2 = 8

- number of neutrons = 18-10 = 8 ✅

particle T^+

- nucleon number = 22

- proton number = 10+1 = 11

- number of neutrons = 22-11 = 10

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.

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