Hi, what is the difference between elliptic and ecliptic?

An ecliptic is the trajectory drawn by the race of the Sun on the celestial vault. This is the geocentric point of view, seen from the Earth.

An eclipse occurs when the Moon passes through this plane (in two points, called nodes), precisely at the time of the New Moon or Full Moon. The Sun, the Earth and our satellite are then aligned. In the first case, it will be a solar eclipse (the Moon is between the Earth and the Sun). In the second, it will be a lunar eclipse

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.

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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.