Select all the correct answers.

if a uranium atom undergoes both alpha and gamma decay, what happens to it?

1. the nucleus loses neutrons.
2. the nucleus loses positrons.
3. the nucleus loses protons.
4. the nucleus loses energy.
5. the nucleus loses electrons.

1, 3 and 4.

In an alpha decay, the atom's mass number is reduced by 4, and the atomic number is reduced by two following the emission of an alpha particle (2 protons and 2 neutrons).

In gamma decay, the atom releases energy spontaneously to stabilize itself, and this energy is released in the form of photons.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

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.