4
More the number of shells in an atom, more away will be the electrons from the nucleus. Hence, weaker will be the attraction between nucleus and outermost electrons. So atom with more shells will let go their electrons easier than atoms with fewer shells.
Mercury has 80 electrons which means there are 6 shells in a neutral atom of mercury.
Berkelium has 97 electrons, which means it has 7 electron shells.
None. Electrons are found in energy levels outside the nucleus, not in it. An atomic number of 20 tells you there are 20 protons in the nucleus of an atom, and 20 electrons in energy levels (or shells or orbitals depending on which model of the atom you are using) outside the nucleus.
Hydrogen has only one valence electrons.
Calcium has 20 electrons in its electronic configuration, therefore it has 20 shells.
20 electrons would need 4 shells. The first shell can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third shell can hold up to 18 electrons, and the fourth shell can hold up to 32 electrons.
iron has 4 shells because there are 30 electrons.
46
Tungsten has 74 electrons!!
More the number of shells in an atom, more away will be the electrons from the nucleus. Hence, weaker will be the attraction between nucleus and outermost electrons. So atom with more shells will let go their electrons easier than atoms with fewer shells.
Mercury has 80 electrons which means there are 6 shells in a neutral atom of mercury.
Berkelium has 97 electrons, which means it has 7 electron shells.
Calcium is in group 2, period 4 of the periodic table. It has an electron configuration of 1s2 2s2 2p6 3s2 3p6 3d10 4s2. This shows us that 4 is its valence shell. Therefore, the other 3 shells are its core shells.
None. Electrons are found in energy levels outside the nucleus, not in it. An atomic number of 20 tells you there are 20 protons in the nucleus of an atom, and 20 electrons in energy levels (or shells or orbitals depending on which model of the atom you are using) outside the nucleus.
1
A neutral xenon atom has 54 electrons. Two of its electron shells would be completely filled, with 2 and 8 electrons, leaving 44 electrons in the remaining electron shells.