Question

The positively charged center in an atom is called as:
A. Nucleus
B. Neutrons
C. Protons
D. Electrons

Answer 1

Hint- In order to deal with this question first we will understand the terms atom, proton, neutron then according to the atomic particle diagram we will try to find out our answer.

Complete answer:
Atom: The smallest volume of matter that nevertheless maintains its status as a chemical element and it constitutes of a nucleus surrounded by electrons.
Atomic Particles
Atoms are composed of three elementary particles: protons, electrons , and neutrons. Atom nucleus (center) includes the protons (positively charged) and the neutrons (without charge). The atom's outermost regions are called electron shells and have the electrons (negative charged).
Proton: Positively charged subatomic particle forms part of an atom's nucleus, and decides an element's atomic number. Weighing 1 amu.
Neutron: A subatomic particle that forms part of an atomic nucleus. There's no charge to it. It is equal to a proton in mass, or weights 1 amu.
Figure:

Hence, positively charged center in an atom is called as nucleus.

So, the correct answer is option A.

Note- An atom is the smallest unit of ordinary matter constituent which constitutes a chemical element. Each solid , liquid, gas, and plasma consists of either neutral or ionized atoms. Atoms are extremely small , usually approximately 100 picometers across. There are various models of atom, some of them are: Dalton model (Billiard ball model), Thomson model (Plum pudding model), Lewis model (Cubical atom model), Nagaoka model (Saturnian model), Rutherford model (Planetary model), Bohr model (Rutherford–Bohr model).