If an atom has 43 electrons and 56 neutrons and 43 protons what is its approximate atomic mass?

Answer 1

Atomic Mass of an element is measured in atomic mass units (amu), and is usually only slightly higher than its atomic mass number (except for elements having many different isotopes). The mass of a neutron is 1.00866 amu and the mass of a proton is 1.00728 amu. The mass of electrons is so insignificant that they are ignored. The atomic mass of an atom with 56 neutrons and 43 protons is (56 x 1.00866 amu) + (43 x 1.00728 amu) = ~99.8 amu.

Answer 2

The number of protons is the atomic number of an element, and this is the number that is used to place elements on the periodic table. So, if you look at the Periodic Table for element 104, you will see that it is Rf or Rutherfordium. So that is your answer- Rutherfordium, no matter what the number of neutrons are. However, you could identify the Rutherfordium atom with 157 neutrons as an isotope of Rutherfordium called Rutherfordium-161.

Answer 3

Electrons are not counted in atomic mass, but since all elements on the periodic table are balanced, it gives us the number of protons -104. Add the number of protons and neutrons to get atomic mass. The plus one charge is a trick, it doesn't mean an extra proton ( that would give you a different element) it means the loss of an electron which has no effect on mass.

Answer 4

The atomic mass of an atom can be calculated by adding the number of protons and neutrons together. In this case, the atom has 43 protons and 56 neutrons, so its atomic mass would be approximately 99 (43 + 56).

Answer 5

Rutherfordium (the atom you are reffering to) has an atomic mass of 261 amu. Although you have an isotpe but 261 is still farely accurate for an aproxamation

Answer 6

The atomic mass number is the sum of the numbers of protons and neutrons in an atom, in this instance 99.

Answer 7

If the charge is -1, then the mass number would be 260. If the charge is +1, then the mass number would be 262.

Answer 8

104 + 157 = 261