States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
The radius of a strontium atom is 215 pm. How many strontium atoms would have to be laid side by side to span a distance of 4.96 mm?
Given that
Radius of strontium atom = 215 pm .
Since we know that
Diameter = 2 × Radius =2 × 215 pm = 430 pm
Therefore,
Diameter of one atom = 430 pm = 430 × 10-12 m = 430 × 10-10 cm = 430 × 10-9 mm
Note : 1 pm = 10-12 m , 1 m = 100 cm , 1 cm = 10 cm
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