Question

The particles present in the nucleus of the atom:
A. Proton and electron
B. Electron and neutron
C. Proton and neutron
D. None of these

Answer 1

Hint: To answer this question, you should recall the model of an atom and how the subatomic particles are arranged in an atom. Electrons are found revolving around in orbits.

Complete step by step answer:
The model suggests that atoms are made of smaller subatomic particles. In the middle of every atom is the nucleus. The nucleus contains types of subatomic particles, protons and neutrons.
The protons have a positive electrical charge and the neutrons have no electrical charge. The third type of subatomic particle, electrons, moves around the nucleus. The electrons have a negative electrical charge. An atom usually contains an equal number of positively charged protons and negatively charged electrons. This makes the atom itself electrically neutral. The electrons exist at different energy levels, called shells, around the nucleus. The shell can only accommodate a limited number of electrons.

Hence, the correct answer to this question is option C.

Note:
Make sure you remember the difference between isotopes, isotone, isobars and isoelectronic species. Isotopes refer to the atoms of the same element having the same atomic number but different mass numbers. According to Moseley’s law, the chemical properties of an element depend on the number of electrons present and their configuration within an atom and as the isotopes have the same number of electrons it results in the fact that they exhibit similar chemical properties. Isotones refer to two nuclides which have the same number of neutrons, but different proton number. Isoelectronic species refers to the elements or ions that have an equal number of electrons. Isobars refer to the atoms of different elements with different atomic numbers but the same mass numbers. They have different chemical properties because they have different atomic numbers.