The atomic number of an atom (Z) is equal to the number of protons.
The mass number of an atom (A) is equal to the number of protons plus the number of neutrons (N), i.e. A = Z + N
Therefore, N = A - Z = 7 - 3 = 4.
So, this neutral lithium atom has 4 neutrons.
Answer: 4.
Answer:
Soap decreases surface tension by changing the way water behaves on the surface. Hard and soft water react differently when soap is added to them.
Explanation: i think it is this
Gallium element with symbol Ga has an atomic number of 31.
Electrons start filling orbitals in increasing energy levels.
First energy shell contains the s orbital which can hold only 2 electrons.
Second energy shell contains a both p orbital and s orbital, p orbital can hold upto 6 electrons, so a total of 8 electrons in the 2nd shell.
Third energy shell contains s, p and d orbital. d orbital can hold upto 10 electrons, so the third shell can hold up to 18 electrons.
electronic configuration of Ga is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^1
we are asked to write in the condensed form, which means we have to write the noble gas with the nearest electronic configuration to Ga.
Noble gas with electronic configuration closest to Ga is argon with atomic number 18.
Ar - 1s^2 2s^2 2p^6 3s^2 3p^6
Ga in condensed form - [Ar] 3d^10 4s^2 4p^1
Answer: CaSO3
Explanation:Please see attachment for explanation