The compounds Na₂O, Al₂O₃ and SO₂ respectively are

Which of the following properties of the halogens increase from F to I? *

I. Atomic radius, II. Melting point, III. Electronegativity

For which element are the group number and the period number the same?

Which of the physical properties decrease with increasing atomic number for both the alkali metals and the halogens?

I. Atomic radius

II. Ionization energy

III. Melting point

Which of the reactions below occur as written? *

I. Br₂ + 2I^– → 2Br^– + I₂

II. Br₂ + 2Cl^– → 2Br^– + Cl₂

Rubidium is an element in the same group of the periodic table as lithium and sodium. It is likely to be a metal which has a

When the following species are arranged in order of increasing radius, what is the correct order?

What increases in equal steps of one from left to right in the periodic table for the elements lithium to neon?

Which property decreases down group 17 in the periodic table?

Which properties are typical of most non-metals in period 3?

I. They form ions by gaining one or more electrons.

II. They are poor conductors of heat and electricity.

III. They have high melting points.

A potassium atom has a larger atomic radius than a sodium atom. Which statement about potassium correctly explains this difference?

Which factors lead to an element having a low value of first ionization energy?

I. large atomic radius

II. high number of occupied energy levels

III. high nuclear charge

Which statement about electronegativity is correct?

Which statement is correct for a periodic trend?

Which compound of an element in period 3 reacts with water to form a solution with a pH greater than 7?

Which equation represents the first ionization energy of fluorine?

Which element is a transition metal?

When Na, K, and Mg are arranged in increasing order of atomic radius (smallest first), which order is correct?

Which oxides produce an acidic solution when added to water?

I. SiO₂

II. P₄O₁₀

III. SO₂