The element with atomic number 20 has what electron configuration?

Which of the following elements has the highest electronegativity in the second period?

Which group in the periodic table contains elements with the valence electron configuration ns²np⁵?

Which of the following elements is least reactive?

Which element in the third period has the highest ionization energy?

Which element in the fourth period exhibits the most metallic character?

Which of the following elements has the lowest ionization energy in group 2?

The elements in the same group of the periodic table have:

Which element has the electron configuration [Ne]3s²3p¹?

Which of the following elements has the largest atomic radius in the fourth period?

Which of the following elements has the highest electron affinity in group 17?

Which of the following elements is not a transition metal?

Which pair of elements is most likely to form a covalent bond?

Which element in group 14 has the highest melting point?

Which of the following elements has the lowest first ionization energy in the third period?

The horizontal rows in the periodic table are called:

Which element has an atomic number of 10?

Which of the following elements has the highest electronegativity in group 15?

Which of the following elements has the electron configuration [Ar]4s²3d⁶?

Which element in group 1 is the least reactive?

Which of the following elements has the highest second ionization energy?

Which element has the most metallic character in the second period?

Which element has an atomic number of 7?

Which group in the periodic table contains the alkaline earth metals?

Which element in group 16 has the highest electronegativity?