What is the edge length of a face-centered cubic unit cell made up of atoms having a radius of 144 pm?

407pm is the edge length of the cubic unit cell

Explanation:

In a Face-centered cubic unit you can use Pythagoras theorem to relate edge length with atomic radius (As you can see in the picture), thus:

e²+e² = (4r)²

2e² = 16r²

e = √8 r

If the atomic radius of the atom is 144pm:

e = √8 ×144pm

e = 407ppm

407pm is the edge length of the cubic unit cell

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.