What differentiates two electrons in an orbit?
(A) Magnetic quantum number
(B) Spin quantum number
(C) fundamental quantum number
(D) Azimuth quantum number
The spin of two electrons located in the same orbital is found to be opposite, hence the spin between them is known by the quantum number.
Loaders contain ___.
(A) Same mass numbers but different atomic numbers
(B) Different weight numbers but same numbers
(C) Same weight and atomic numbers
(D) Different weights and atomic numbers
Nuclei are classified based on the number of protons (atomic number) or the total number of nucleons (mass number):
Isotopes: Atoms of an element which have the same atomic number but different mass numbers are called isotopes. All isotopes have similar chemical properties.
Isobar: Nuclei which have the same mass number (A) but a different atomic number (Z) are called isobar.
Even-neutronic: Nuclei having equal number of neutrons are called even-neutronic. For them both atomic number (Z) and mass number (A) are different, but the value of (A – Z) is the same.
Ethylene is a __molecule.
(A) polar
(B) ionic
(C) covalent
(D) non-polar
Ethylene (IUPAC name: ethene) is a hydrocarbon whose molecular formula is C2H4 or H2C=CH2. It is a colorless, flammable gas with a mild sweet musky odor. Ethylene is used extensively in chemical industries.
The electrons located in the highest energy level of an atom are called ___.
(A) Valence protons
(B) orbital protons
(C) valence electrons
(D) valence electrons
The outermost orbital shell of an atom is called its valence shell, and the electrons present in the valence shell are called valence electrons. The valence electrons of an atom are electrons with higher energy and hence they are more reactive.
Which of the following will be a negative ion?
(A) If it has more electrons than protons
(B) If it has more electrons than neutrons
(C) If it has more protons than electrons
(D) If it has more protons than neutrons
If an atom has more electrons than protons, it is a negative ion or anion. If it has more protons than electrons, it is a positive ion.
Electrons rotate around the center in _motion.
(A) conversion
(B) spin
(C) orbital
(D) vibration
Electrons revolve around the nucleus in orbital motion. This motion involves the quantum mechanical motion of particles (electrons in this perspective). Orbital motion involves translation of the center of mass rather than rotation (rotation of the axis).
Which of the following elements has higher atomic number than fluorine?
(A) Sodium
(B) Beryllium
(C) Nitrogen
(D) Boron
The atomic number of sodium (11) is higher than that of fluorine (9). ,
__ is a microparticle which does not have any electric charge.
(A) electron
(B) proton
(C) neutron
(D) all options are correct
Atom: The smallest particle of any element which has all the chemical and physical properties of that element,
Is called atom. An atom consists of three subatomic particles: the electron, the proton, and the neutron. Protons and neutrons reside in the nucleus and electrons move around the nucleus on a particular path.
The electron has a negative charge on itself and the proton has a positive charge.
The neutron is neutral.
What are the components of the nucleus of an atom?
(A) only proton
(B) Proton and neutron
(C) Neutron and electron
(D) only neutrons
An atom has three parts: protons, electrons, and neutrons. The nucleus contains protons and neutrons and electrons revolve around the nucleus. The proton has a positive charge, the electron has a negative charge and the neutron has no charge.
The __nature of the bond between two atoms is greater if the difference in their electronegativity is less.
(A) polar
(B) metallic
(C) ionic
(D) covalent
When the difference in electronegativity between two atoms is very high then an ionic bond is formed.
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