How does density change across period 3?

As you move from left to right across period 3, there is an increase in the density until a maximum (at Si in Group IV) and begins to decrease moving towards Ar. The atomic radius determines the volume of the elements and the crystal structure tells you how closely packed the atoms in an element are to each other.

What are the trends in period 3?

Melting and boiling points increase across the three metals because of the increasing strength of their metallic bonds. The number of electrons which each atom can contribute to the delocalized “sea of electrons” increases. The atoms also get smaller and have more protons as you go from sodium to magnesium to aluminum.

What are the properties of period 3 elements?

In the whole of period 3, the outer electrons are in 3-level orbitals. These are all the same sort of distances from the nucleus, and are screened by the same electrons in the first and second levels. The major difference is the increasing number of protons in the nucleus as you go from sodium across to argon.

What element is in period 3?

The third period contains eight elements: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon. The first two, sodium and magnesium, are members of the s-block of the periodic table, while the others are members of the p-block.

Why is chlorine in period 3?

It has the highest electron affinity and the third highest electronegativity of all the elements; thus chlorine is a strong oxidizing agent.

Which three elements in the third period are metals?

The third period contains eight elements: sodium (Na), magnesium (Mg), aluminium (Al), silicon (Si), phosphorus (P), sulfur (S), chlorine (Cl), and argon (Ar). Among these, three are metals (sodium, magnesium, aluminium), four are nonmetals (phosphorous, sulfur, chlorine, argon) and one is metalloid (silicon).

What are the 3 elements?

Three Elements

• We all know oxygen, silicon, and aluminum are common elements in the Earth’s crust.
• The combined occurrences for these three elements are very well known.
• For all three together, we find the mineral kyanite.

Which metal is the softest and least dense in period 3?

Europium is the least dense, the softest, and the most volatile member of the lanthanide series.

Which of the Period 3 elements is the strongest reducing agent?

Sodium is the strongest reducing agent. Chlorine is the strongest oxidizing agent.