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

What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present? a. $\frac{235}{92} \mathrm{U}$ b. $_{13}^{2} \mathrm{Al}$ c. $\frac{57}{26} \mathrm{Fe}$ d. $\frac{208}{82} \mathrm{Pb}$ e. $\frac{86}{32} \mathrm{Rb}$ f. $\frac{41}{20} \mathrm{Ca}$

What number of protons and neutrons is contained in the nucleus of each of the following atoms? Assuming each atom is uncharged, what number of electrons is present?
a. $\frac{235}{92} \mathrm{U}$
b. $_{13}^{2} \mathrm{Al}$
c. $\frac{57}{26} \mathrm{Fe}$
d. $\frac{208}{82} \mathrm{Pb}$
e. $\frac{86}{32} \mathrm{Rb}$
f. $\frac{41}{20} \mathrm{Ca}$

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Key Concepts

Isotopes

Isotopes are atoms of the same element that have the same number of protons but differing numbers of neutrons. This variation in neutron count can affect the atomic mass and some nuclear properties, though the chemical properties remain largely similar.

Electrons in Neutral Atoms

In an uncharged (neutral) atom, the number of electrons equals the number of protons. This balance of charged particles ensures that the overall electrical charge of the atom is zero, which is essential for its stability.

Mass Number

The mass number is the total count of protons and neutrons in an atom's nucleus. It provides an approximate measure of the atomic mass and is used in determining the isotope of an element.

Atomic Number

The atomic number represents the number of protons in the nucleus of an atom. It is a fundamental property that defines the identity of the element on the periodic table and directly influences the behavior of the atom in chemical reactions.

Neutrons

Neutrons are electrically neutral particles found in the nucleus alongside protons. The number of neutrons in an atom can be determined by subtracting the atomic number from the mass number, and variations in neutron count result in different isotopes of the same element.

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