21p+21e+24n=66
In this case, the number 209 represents the sum of protons + neutrons.
Calcium atoms have 20 protons and 20 electrons. The number of neutrons varies with the isotope.
A scandium atom has 3 valence electrons.
The answer depends on the atom! The total number of subatomic particles in an atom of an isotope is the sum of the mass number and the atomic number of the isotope; the mass number counts the protons and neutrons together, and the atomic number recounts the number of protons, which in a neutral atom must be the same as the number of protons.
Potassium's atomic number is 19, meaning it has 19 protons in its nucleus. In a neutral potassium atom, there are also 19 electrons orbiting the nucleus. The most common isotope of potassium, K-39, has 20 neutrons, giving it a total of 39 subatomic particles.
The total number of subatomic particles in the nucleus
False; the atomic number is the total number if protons in the nucleus only.
In this case, the number 209 represents the sum of protons + neutrons.
Sulfur has 16 protons and electrons; the number of neutrons is specific for each isotope: Number of neutrons in a sulfur isotope = Mass number - 16
Atomic Mass units =]
Calcium atoms have 20 protons and 20 electrons. The number of neutrons varies with the isotope.
A scandium atom has 3 valence electrons.
The answer depends on the atom! The total number of subatomic particles in an atom of an isotope is the sum of the mass number and the atomic number of the isotope; the mass number counts the protons and neutrons together, and the atomic number recounts the number of protons, which in a neutral atom must be the same as the number of protons.
212
Protons and neutrons. The amu of an atom is the total number of protons and neutrons added together.
Rubidium has 37 electrons and protons; the number of neutrons is specific for each isotope. Number of neutrons in a rubidium isotope = Mass number - 37
Potassium's atomic number is 19, meaning it has 19 protons in its nucleus. In a neutral potassium atom, there are also 19 electrons orbiting the nucleus. The most common isotope of potassium, K-39, has 20 neutrons, giving it a total of 39 subatomic particles.