What number of protons and neutrons are contained in the...

What number of protons and neutrons are contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons are present? a. $\frac{235}{92} \mathrm{U}$ b. $^{27} \mathrm{Al}$ c. $\frac{57}{26} \mathrm{Fe}$ d. $\frac{208}{81} \mathrm{~Pb}$ e. $\frac{\mathrm{x}}{37} \mathrm{Rb}$ f. ${ }_{21}^{4} \mathrm{Ca}$

What number of protons and neutrons are contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons are present?
a. $\frac{235}{92} \mathrm{U}$
b. $^{27} \mathrm{Al}$
c. $\frac{57}{26} \mathrm{Fe}$
d. $\frac{208}{81} \mathrm{~Pb}$
e. $\frac{\mathrm{x}}{37} \mathrm{Rb}$
f. ${ }_{21}^{4} \mathrm{Ca}$

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Key Concepts

Atomic Number

The atomic number is the number of protons in the nucleus of an atom. It uniquely identifies a chemical element and determines its position in the periodic table. In nuclear notation, it is typically represented as a subscript or placed before the element symbol.

Mass Number

The mass number is the total number of protons and neutrons (nucleons) in the nucleus of an atom. This value, usually placed as a superscript in nuclear notation, provides information about the isotope of the element being considered.

Determination of Neutrons

The number of neutrons in an atom can be determined by subtracting the atomic number (number of protons) from the mass number (total nucleons). This calculation is essential for identifying isotopes and understanding nuclear stability.

Electrons in a Neutral Atom

In a neutral atom, the number of electrons is equal to the number of protons. This balance of positive and negative charges ensures that the atom is electrically neutral, which is crucial for predicting chemical behavior and bonding.

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