So i have to say the techdroider render of the Pixel XL is likely wrong, considering it has essentially 0 bezel, I assumed some minor bezel when I synced up the sizes. But given the data available, and assuming the screen sizes are correct (Pixel 5.0, Pixel XL 5.5) then this should be pretty close.
Valency, the combining capacity of an element, is equal to the number of electrons needed, or required to be removed from the outermost shell of the atom of that element, to have a complete 'octet'. The helium atom has only the 1s orbital in its only shell, and it is completely filled with 2 electrons. Its electronic configuration is 1s2. Therefore, helium and the other inert gases with complete octets normally do not take part in chemical reactions. They are considered as zero-valent elements.
Helium has 2 protons and 2 neutrons. A particle number of 2 is especially stable in a nucleus. This is because of the shell structure, and it's analogous to the stability of the noble gases in atomic physics. Helium has 2 protons and 2 neutrons. A particle number of 2 is especially stable in a nucleus. This is because of the shell structure, and it's analogous to the stability of the noble gases in atomic physics. For more on this, google magic number.. And merely saying helium is grossly misleading. Alpha particle is specifically helium 4. Helium 4, like helium atom, has extreme stability because of closed shells. 2 electrons of opposite spins both in their lowest state, 2 protons of opposite spin ditto, 2 neutrons of opposite spin ditto. Nothing else matches that stability.