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Chapter 2: Q.2.36 P (page 82)

Define atomic number and mass number which can vary without changing the identity of the element?

Short Answer

Expert verified

The atomic number of an element is the number of protons in the nucleus of an atom. The mass number of an element is the sum of several protons and neutrons present in the nucleus of an atom. The mass number can vary without changing the identity of an element.

Step by step solution

01

Atomic number of an atom.

The atomic number of an element is the number of protons in the nucleus of an atom. Each atom of a particular element has the same atomic number and different elements have different atomic numbers. The atomic number is represented by Z.

For example; The number of protons in the nucleus of Sodium is 11. Hence an atomic number of Sodium is 11.

02

Step 2:Mass the number of an atom.

The mass number of an element is the sum of several protons and neutrons present in the nucleus of an atom. Each proton and neutrons contribute one unit to the mass number.

For example; The sodium atom has protons 11 and neutrons 12 in its nucleus and has a mass number 12 of u.

03

Step 3:Variation without changing identity:

The mass number of an element can vary without changing the identity of an element as the atoms of the same element can have different mass numbers due to the different number of neutrons present in the nucleus, they are called isotopes.

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Most popular questions from this chapter

When neptunium (Np) and plutonium (Pu) were discovered, the periodic table did not include the actinides, so these elements were placed in Group 7B(7) and 8B(8). When americium (Am) and curium (Cm) were synthesized, they were placed in Group 8B(9) and 8B(10). However, during chemical isolation procedures, Glenn Seaborg and his group, who had synthesized these elements, could not find their compounds among other compounds of these groups, which led Seaborg to suggest they were part of a new inner transition series.

(a) How do the electron configurations of these elements support Seaborg鈥檚 suggestion?

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