Atomic Structure - exam practice

Which mass spectrum best represents bromine molecules with equal ⁷⁹Br and ⁸¹Br isotope proportions?

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?

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 atom has the smallest number of neutrons?

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

What is correct for the chromium isotope ⁵³₂₄Cr?

Which representation would be correct for a species, Z, which has 31 protons, 4 neutrons and 28 electrons?

What is the number of protons and the number of neutrons in ¹³¹I?

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

Which electron transition in the hydrogen atom emission spectrum emits radiation with the longest wavelength?

What is the correct statement about the emission spectrum of hydrogen in the visible region?

Which electron transition emits radiation of the longest wavelength?

Which is correct for the line emission spectrum for hydrogen?

In which set do all the species contain more electrons than neutrons?

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

What is the A_r of the element?

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

Which species could be responsible for the peak at m/z = 32.5?