If an element has an atomic number of 7 and an atomic mass
number of 15, how many protons, neutrons, and electrons does it
possess?
a) 7 protons, 8 neutrons, and 7 electrons
b) 7 protons, 8 neutrons, and 8 electrons
c) 8 protons, 7 neutrons, and 8 electrons
d) 15 protons, 8 neutrons, and 8 electrons
Consider an isotope with an atomic number of [2(5+A)] and a mass
number of [4(5+A)+2]. Using the atomic masses given in the attached
table, calculate the binding energy per nucleon for this isotope.
Give your answer in MeV/nucleon and with 4 significant figures.
(A=8)
A particular radioactive isotope has a half-life of (2.50+A)
hours. If you have (24.5+B) g of the isotope at 10:00 AM, how much
will you have at 7:30 PM? Give your answer in grams (g)and with...
The atomic mass of the stabile isotope of an element can be
calculated by adding together the number of __________ in an atom
of that element. A) protons and neutrons B) energy levels C)
protons and electrons D) neutrons and electrons E) isotopes
A hypothetical element Ec has an atomic number of 156 and an
atomic mass of 300.
1. How many neutrons and electrons would be found in a neutral
Ec atom?
2. If one proton were removed from Ec, would it still be the
same element?
3. If one electron were to be gained by an atom of Ec, would
it still be the same element? Would anything change about the
element?
An element, X has the mass number 46. There are six more neutrons than protons in this element. Identify the element X. Find the number of protons, neutrons, and electrons in it. How will the number of protons, neutrons, and electrons change when this element is ionized to X2+?