Atomic Structure - exam practice

How many orbitals are there, in total, in the first three energy levels of an atom?

This question refers to isolated gaseous atoms.

In which atom are all electrons paired?

The electronic configuration of the two outermost shells of an atom is 3s²3p⁶3d⁵4s².

What is this atom?

Which statement about an atom of ²³Na is correct?

Which statement about p-orbitals is correct?

What is a possible mass number of a magnesium isotope?

An element forms ions with a charge of 3+.

What could be the electron configuration of the atoms of the element?

What is the shape of an s-orbital?

Which element has atoms with the greatest number of singly occupied orbitals?

Which ion has a different number of electrons from the other three ions?

A sample of naturally occuring boron contains the isotopes ¹⁰B and ¹¹B.

The relative atomic mass of the boron sample is 10.8.

What is the percentage of ¹¹B atoms in the sample of boron?

Which statement about time of flight mass spectrometry is correct?

What is the electron configuration of V²⁺ in the ground state?

Which atom has the smallest number of neutrons?

Which is the electron configuration of an atom with only two unpaired electrons?

The mass spectrum of a sample of an element is shown above.

What is the A_r of the element?

What is the relative atomic mass, A_r, of an element with this mass spectrum?