Calculate the mass defect for beryllium-9, the only isotope of beryllium. The mass of beryllium-9 is 9.012182 amu. The mass of a proton (p11) is 1.00728 amu; the mass of a neutron (n01) is1.00866 amu, and the mass of an electron(e10) is0.00055 amu.

Mass defect = - 0.060238 amu

Explanation:

To calculate the mass defect:

1. add up the masses of each proton and of each neutron that make up the nucleus,

Berylium 9 has;

4 protons = 4 * 1.00728 amu = 4.02912 amu

5 Neutrons = 5 * 1.00866 amu = 5.0433 amu

Sum = 9.07242 amu

2. subtract the actual mass of the nucleus from the combined mass of the components to obtain the mass defect.

Mass defect = Actual Mass - Combined mass

Mass defect = 9.012182 amu - 9.07242 amu

Mass defect = - 0.060238 amu

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

i think it's letter a.