A chemical compound has the following Lewis notation: How many valence electrons does element Y have?

Element Y has six valence electrons. Valence electrons are the electrons present in the outermost shell of an atom. Lewis symbols are the symbols that represent the valence electrons of an atom within a molecule. It uses dots or crosses to represent the valence electrons of an atom.

A chemical compound has the following Lewis notation: What is the valency of element Y ?

Valency is defined as the number of electrons an atom gains or loses or shares to acquire a stable electronic configuration. Since the number of valence electrons of element Y is six. It needs 2 more electrons to complete its octet and achieve a stable electronic configuration. Therefore, the valency of element Y is 2 .

A chemical compound has the following Lewis notation: What is the valency of element X ?

Valency is defined as the number of electrons an atom gains or loses or shares electrons to acquire a stable electronic configuration. Since the number of valence electrons in element X is 7 . It needs 1 more electron to complete its octet and achieve a stable electronic configuration. Therefore, the valency of element X is 1 .

A chemical compound has the following Lewis notation: How many covalent bonds are there in the molecule?

A covalent bond is a bond that is formed due to the sharing of electrons between atoms. Covalent bonds can be of three types: single bond, double bond and triple bond, based on the number of pair of electrons shared between two atoms. When only one pair of electrons is shared between atoms, it is called a single bond. Single bonds have the least density than the other two bonds. In the diagram, element X and element Y share an electron each to form a single covalent bond. Also, element Y and hydrogen share an electron each to form another single covalent bond. Thus, there exist two covalent bonds in the molecule.

A chemical compound has the following Lewis notation: To which groups the elements X and Y belong?

The group number of an element can be found by calculating the valence electrons of an element. For non-transition metals in the periodic table, the number of valence electrons of the element gives the group number. We know that element X has 7 valence electrons, therefore, it belongs to group 17 . Similarly, element Y has 6 electrons, so, it belongs to group 16 .