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3) Identify the noble gas in the following list A) helium B) nitrogen C) oxygen D) gold E) chlorine 4
) The atomic number of an atom is equal to the number of A) nuclei B) neutrons C) neutrons plus protons D) electrons plus protons E) protons
5) Consider a neutral atom with 30 protons and 34 neutrons. The atomic number of the elementis A) 30 B) 32 C) 34 D) 64 E) 94
6) How many proton are in an isotope of sodium with a mass number of 25% B) 14 C) IS D) 25 E) 32 Isotopes are stoms of the



Answer :

Helium is the noble gas out of the following options given.

The amount of protons an atom contains determines its atomic number.

The atomic number of a neutral atom with 30 protons and 34 neutrons is 30.

An isotope of sodium with a mass value of 25 has 11 protons.

Gases that are noble or inert. Helium, neon, argon, krypton, xenon, and radon are the noble gases, or inert gases, that make up group 8A (or VIII A) of the periodic table. The name of these elements refers to how little they react with other elements or compounds.

The atomic number is determined by the number of protons, which is always equal to the number of electrons in a neutral atom.

Sodium has an atomic number of 11. Since the atomic number in this instance is 11, the number of protons is likewise 11. The number of protons is equal to the atomic number.

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