The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
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Answers
Z=4 A=9
Explanation:
the atomic number Z of an element is number of protons or number of electrons.So it's atomic number is 4.
Atomic mass= atomic number + number of neutrons.=4+5=9
Answer:
Given,
In the atom of an element:
→ Protons = 4
→ Neutrons = 5
→ Electrons = 4
As the no. of protons = no. of electrons, we can infer that the given atom is neutral.
The Atomic number refers to the no. of protons in a given atom. As the no. of protons is 4, the atomic number of the element is 4.
The Mass number refers to the total no. of protons and neutrons in a given atom. As the no. of protons and neutrons are 4 and 5 respectively, the mass number is 4+5 = 9.
Therefore,
Atomic number = 4
Mass number 9
Knowledge Bytes:
→ The given element is beryllium with the chemical symbol Be.
→ The protons refer to the positively charged particles in an atom.
→ The neutrons refer to the electrically neutral sub-atomic particles.
→ The electrons refer to the negatively charged particles in an atom. Their weight is quite negligible.
→ The atomic number denoted by the letter Z is written as a subscript.
→ The atomic mass denoted by the letter A is written as a superscript.