An atom from the column 1 can form an iconic compound with another from column 18
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An electron is a negatively charged subatomic particle present in the space outside the nucleus of an atom. The loss of electron from an atom results in the formation of cation whereas gaining of electron by an atom results in the formation of anion. The cation possesses positive charge due to loss of electron and anion possesses negative charge due to gain of electron.
The neutral atom has no charge on it.
For given atomic symbols:
The atomic number of hydrogen is 1 and the given symbol has no charge that means it is in its neutral state. So, the number of electrons in is 1.
The atomic number of helium is 2 and the given symbol has no charge that means it is in its neutral state. So, the number of electrons in is 2.
The atomic number of hydrogen is 1 and the given symbol has a negative charge that represents a gain of electron. So, the number of electrons in is 2.
The atomic number of helium is 2 and the given symbol has two positive charge that represents loss of two electrons. So, the number of electrons in is 0.
Hence, has no electrons.
<u>Answer:</u> The volume of HCl needed is 0.250 L
<u>Explanation:</u>
To calculate the number of moles for given molarity, we use the equation:
<u>For sodium carbonate:</u>
Molarity of sodium carbonate solution = 0.500 M
Volume of solution = 0.750 L
Putting values in above equation, we get:
The chemical equation for the reaction of sodium carbonate and HCl follows:
By Stoichiometry of the reaction:
1 mole of sodium carbonate reacts with 2 moles of HCl
So, 0.375 moles of sodium carbonate will react with = of HCl
Now, calculating the volume of HCl by using equation 1:
Moles of HCl = 0.750 moles
Molarity of HCl = 3.00 M
Putting values in equation 1, we get:
Hence, the volume of HCl needed is 0.250 L