Valence Electrons: Definition, Representation, Characteristics. 1 1. Conductors. All metals behave as good conductors of electricity. The presence of 1, 2 and 3 electrons in the outermost shell of the atoms enables ... 2 2. Semiconductors. 3 3. Insulators. 4 2. Sulphur has 6 valence electrons. 5 3. Neon has 8 Valence electrons. More items
Ans. When only seven electrons are present in the outermost shell of an atom, then the atom is said to possess seven valence electrons. Elements having seven valence electrons are present in group 17 of the Periodic Table. This group of elements consists of Halogens.
Valence Electron of Elements Periodic Table Group Valence Electrons Alkali metals – Group 1 ( I) 1 Alkaline earth metals – Group 2 ( I I) 2 Boron group – Group 13 ( I I I) 3 Carbon group – Group 14 ( I V) 4 4 more rows ...
Valence electrons are indicative of an atom’s reactivity. The presence of eight electrons in the valence shell of an atom imparts stability to that particular atom. To attain stability, atoms transfer or share electrons within themselves in such a way that they can satisfy the octet rule and attain noble gas configuration.
As valence electrons are significant to an atom’s reactivity, it is important to represent them by simple diagrams. Lewis structures, here, comes into the picture where the valence electrons present in an atom are represented as dots. These structures are also known as electron dot diagrams.
For elements in groups 1 – 2 and 13 – 18, the number of valence electrons is easy to tell directly from the periodic table. The group number represents the number of valence electrons present in the valence shell of the atom. For elements in groups 3 – 12, determining the number of valence electrons is more complicated as the electrons are present in the d shell.
As a result, they may be attracted as much or more by the nucleus of another atom as by their nucleus. Valence electrons are the electrons present in the s and p orbitals. The electrons present in the inner shell are core electrons.
The position of an atom in the periodic table represents the number of valence electrons present in the outermost shell of the atom. Across each row or period of the periodic table, the number of valence electrons in groups 1 – 2 and 13 – 18 increases by one from one element to the next. Thus, within each column or group of the table, all the elements have the same number of valence electrons. That explains why all the elements in the same group have very similar chemical properties.
The electrons present in the outermost shell of the atom are called valence electrons . In the periodic table, the vertical group represents the number of electrons present in the atom’s valence shell,i.e. valence electrons.
Electrons are tiny subatomic particles that revolve around the nucleus in energy shells called orbits. These subatomic particles carry a negative charge of 1.602 × 10 – 19 Coulombs. The mass of an electron is 9 × 10 – 31 k g. The position of electrons around the nucleus is not certain. They continuously revolve around the nucleus in shells with increasing energy, i.e. the shell closer to the nucleus has less energy than the outermost shell. The electrons present in the outermost shell of the atom are called valence electrons. In the periodic table, the vertical group represents the number of electrons present in the atom’s valence shell,i.e. valence electrons. But how do these tiny particles contribute to the chemical character of an atom? Let’s explore this in this article.
Sodium easily loses an electron because it belongs to group 1 ( A) of the periodic table. It has only one valence electron present in the outermost shell, which it readily loses to attain the stable noble gas electronic configuration of Neon ( 2, 8).