Write the atomic symbol for an element giving the atomic number and ma

1.	Write the atomic symbol for an element giving the atomic number and mass number. Give two examples. Which of the two numbers is characteristic of the element? Why?
Answer» An atom is represented as \(^A_ZX\), where X is the chemical symbol for the element, Z is the atomic number and A is the mass number. Examples : Fluorine, \(^{19}_9F\); Phosphorus, \(^{31}_{15}p\); Gold, \(^{197}_{73}Au.\) The atomic number of an element, which is the number of protons in the nucleus of an atom of the element, is characteristic of the element. It equals the number of electrons in the atom and hence determines the chemical properties of the element and its place in the modern periodic table.

Write the atomic symbol for an element giving the atomic number and mass number. Give two examples. Which of the two numbers is characteristic of the element? Why?

Answer»

An atom is represented as \(^A_ZX\), where X is the chemical symbol for the element, Z is the atomic number and A is the mass number. Examples : Fluorine, \(^{19}_9F\); Phosphorus, \(^{31}_{15}p\); Gold, \(^{197}_{73}Au.\)

The atomic number of an element, which is the number of protons in the nucleus of an atom of the element, is characteristic of the element. It equals the number of electrons in the atom and hence determines the chemical properties of the element and its place in the modern periodic table.

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