An endothermic reaction is the opposite. This is when a reaction starts colder and ends up hotter, taking in energy from start to finish. In an endothermic reaction, the system gains heat as the surroundings cool down. In an exothermic reaction, the system loses heat as the surroundings heat up.
When gases in containers are heated, their molecules increase in average speed. This means that they exert a greater force when they collide with the container walls, and also collide with the walls more frequently. The gas is therefore under greater pressure when its temperature is higher.
Answer:
phosphorus
Explanation:
15 is the atomic number, so you know phosphorus has 15 protons.
Answer:
Explanation:
Then, multiply the number of moles of Na by the conversion factor 6.02214179×1023 atoms Na/ 1 mol Na, with 6.02214179×1023 atoms being the number of atoms in one mole of Na (Avogadro's constant), which then allows the cancelation of moles, leaving the number of atoms of Na.Aug 15, 2020
Among these three halogen Bromine has the greatest atomic radius. As Bromine is present in 4rth period it outermost electrons are present in 4rth shell, so greater the number of shells greater is the size of an atom. While, in case of chlorine and fluorine they are present in group 3 and 2 respectively.