Which of the following is the most electronegative element?

• O

• La

• Rb

• Mg

• N

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element exhibits the greatest number of different oxidation states?

• O

• La

• Rb

• Mg

• N

Which of the following elements has the smallest ionic radius for its most commonly found ion?

• O

• La

• Rb

• Mg

• N

Tags

NGSS.HS-PS1-1

The energy required to convert a ground-state atom in the gas phase to a gaseous positive ion

• activation energy

• free energy

• ionization energy

• kinetic energy

• lattice energy

Tags

NGSS.HS-PS1-4

The energy change that occurs in the conversion of an ionic solid to widely separated gaseous ions.

• activation energy

• free energy

• ionization energy

• kinetic energy

• lattice energy

Tags

NGSS.HS-PS1-4

Which of the following is a gas in its standard state at 298 K?

• Lithium

• Nickel

• Bromine

• Uranium

• Fluorine

The elements in which of the following have most nearly the same atomic radius?

• Be, B, C, N

• Ne, Ar, Kr, Xe

• Mg, Ca, Sr, Ba

• C, P, Se, I

• Cr, Mn, Fe, Co

Tags

NGSS.HS-PS1-1

A solution is known to contain an inorganic salt of a one of the following elements. The solution is colorless. The solution contains a salt of

• Cu

• Mn

• Fe

• Ni

• Zn

Which two subatomic particles are in the nucleus?

• Protons and Neutrons

• Protons and Electrons

• Neutrons and Electrons

Tags

NGSS.HS-PS1-8

 After the atom is ionised, it then requires more energy to remove a second electron because the second electronis nearer the nucleus.

• False
• True
• Not sure