Ionic compounds are between metals and non-metals

Ionic compounds are between metals and non-metals. Molecular (covalent) compounds are between only non-metals. (Metallic compounds are between metals and other metals). An ionic compound is a pure substance that is formed from a metal and a nonmetal. It has a fairly high melting point and is a conductor of electricity when in a molten or aqueous state. A molecular compound, on the other hand, is a pure substance that is formed from nonmetals. It has a fairly low melting point, and cannot conduct electricity regardless of state. Another important difference between the two is that an ionic compound is a crystalline solid at standard temperature and pressure (STP), whereas a molecular compound can be in a solid, gas or liquid state at STP. Molecular compound is derived from combinations of different molecules while ionic compound is derived from inducing electrical current into molecules. 

Coming to the benefits of the nuclear energy. It is better in many terms. Nuclear power prevents from air pollution the pollution that are made by burning of coals in hydroelectricity power plants. The energy production with respect to other sources are comparatively less than from this. That means the production of energy is more and a result of that the electric cars can run freely on the roads without the fear of recharging their batteries (Ramamoorthy, 2018). This makes the air pollution less and we can feel the best quality of fresh air which helps to keep our body healthier. Air pollution is a type of pollution that is deteriorating human health and having a negative impact on the environment. As a result of this pollution, the ozone layer is thinning, and you will notice that the air is polluted as soon as you step outside the house. Clouds of smoke can be seen coming from the chimneys of buses, scooters, cars, and factories, as well as fly ash (particles of ash scattered in the air) from thermal power plants polluting the air, cars polluting the road, and cigarette smoke polluting the air. Burning sensations in the eyes, chest tightness, and coughing are common when there are more pollutants in the air. Air pollution can also indicate angina (heart disease) or asthma (lung disease), as well as sudden health decline.

Reference:

Ramamoorthy N. (2018). Impact of Nuclear Medicine and Radiopharmaceuticals on Health-care Delivery: Advances, Lessons, and Need for an Objective Value-matrix. Indian journal of nuclear medicine : IJNM : the official journal of the Society of Nuclear Medicine, India, 33(4), 273-276. https://doi.org/10.4103/ijnm.IJNM_56_18