Is oxygen element stable

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Which element have two shells and both these shells are fulfilled with electrons?

EASY

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Which of the following elements has two shells, both of which are completely filled with electrons?

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Match the following :
List -I :
(a) Frequency of distribution of the emitted radiation from a black body
(b) Spin quantum numbers(m_s)
(c) Angular Momentum
(d) All orbital have equal energy

List - II :
(i) degeneracy
(ii) temperature dependent
(iii) vector quantity
(iv) mass times velocity times radius

Codes:

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Two atoms are said to be isobars if

EASY

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

How many valence electrons present in

{Cl}^{-}

ion?

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

If electronic configuration of an atom is

2, 8, 7

, then atomic number of the atom will be

EASY

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Hydrogen contains three types of atoms (

{}_{1}^{1}H

protium,

{}_{1}^{2}H

deuterium,

{}_{1}^{3}H

tritium). These atoms are

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Which one of the followings is correct electronic configuration of sodium?

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

An atom has electronic configuration 2, 8. 7. What is the atomic number of this element.

HARD

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Nitrogen (atomic number $7$ ) and phosphorus (atomic number $15$ ) belong to group $15$ of the Periodic Table. Write the electronic configuration of these two elements. Which one of these will be more electronegative? Why?

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Isotopes of an element contains

EASY

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

What is the maximum number of electrons that can be accommodated in the outermost orbit?

MEDIUM

Physical Sciences>Matter and Its Interactions>Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.>Structure and Properties of Matter - Each atom has a charged substructure consisting of a nucleus, which is made of protons and neutrons,surrounded by electrons.

Two elements P and Q have