Name the element that form +2, +3, +6 ions and has 4 electrons in highest electron cloud.

The element that forms +2, +3 and +6 ions and has 4 valence electrons is chromium.

Explanation:

As, the given element is showing variable oxidation states, so it is a transition metal only.

So, the element that has 4 electrons in the highest electron cloud and is showing variable oxidation state is chromium.

Electronic configuration of chromium:

Energy of 3d orbital is more than 4s orbital and hence, 4s orbital is filled first although the value of 'n' for 3d is less.

The most stable oxidation states of this element are +2, +3 and +6.

Hence, the correct answer is Chromium.

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.

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b