Consider an ideal gas that occupies 1 L in a cylinder with movable piston and under the pressure of 10 atm. If the external pressure of 10 atm comprises 9 atm due to nine pieces of small removeable blocks of equal weights and 1 atm due to atmospheric pressure, calculate the expansion work done by the gas when: (i) the nine blocks are removed from the piston at once
(ii) eight blocks are removed from the piston at once
(iii) eight blocks are removed from the piston in two batches, i. e. four blocks at a time.​

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.