If the symbol x represents a central atom, y represents outer atoms, and z represents lone pairs on the central atom, the structure the central x atom is single bonded to two y atoms, which are 180 degrees apart. the x atom has two lone pairs. could be abbreviated as xy2z2. classify each molecule according to its shape. molecular geometries: (a) linear(b) bent 120(c) bent 109(d) trigonal pyramidal(e) t-shaped(f) see saw(g) square planar(h) square pyramidalpossiblities: (1) xy4z2(2) xy5z(3) xy2z(4) xy2z3(5) xy4z(6) xy2z2(7) xy3z2(8) xy3z

(C) bent 109

(2)

Explanation:

The number of bond pairs = 2

Number of lone pairs = 2

The general formula is -

According to VSEPR theory, the atoms will form a geometry in such a way that there is minimum repulsion and maximum stability.  

The central atom has 2 bond pairs and 2 lone pairs. Hybridization is sp³. The geometry is bent shape which has an angle of approximately 105.5°. It original has angle of 109.5° but due to lone pair repulsion, it reduces.

Answer - (C) bent 109

Square pyramidal possibility:- (2)

The central atom has 5 bond pairs and 1 lone pair. Hybridization is sp³d. The geometry is square pyramidal in which the equatorial bonds has an angle of 120° and axial bond has an angle of 90°.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.