Atomic Structure

The letters X, Y and Z represent different atoms.

³⁷₁₇X   ³⁷₁₈Y   ³⁸₁₈Z

Which statement is correct?

Which ion has fewer electrons than neutrons and fewer neutrons than protons?

What do the ions ¹⁸O²⁻ and ¹⁹F⁻ have in common?

Beams of charged particles are deflected by an electric field. Under identical conditions, the angle of deflection of a particle is proportional to its charge/mass ratio. In an experiment, protons are deflected by an angle of +15° by an electric field. In another experiment under identical conditions, particle Y is deflected by an angle of −5°. What could be the composition of particle Y?

A sample of the element calcium was vaporised, ionised and passed through an electric field. It was observed that a beam of ⁴⁰Ca²⁺ particles gave an angle of deflection of +4°. Assuming an identical set of experimental conditions, by what angle would a beam of ¹⁹F⁻ particles be deflected?

Which of the following species will produce the largest deflection when fired with equal velocity into an electric field?

X, Y and Z are isotopes of three different elements. An isotope of argon has a mass number of 41 and the same number of neutrons in the nucleus as each of the isotopes X, Y and Z. The species Ar, X⁺, Y²⁺ and Z³⁺ all contain the same number of electrons.

What are the mass numbers of X, Y and Z? Each option gives the mass numbers of X, Y and Z in that order.

A stream of gaseous ¹⁶₈O²⁻ ions was passed between two oppositely charged plates. Analysis of the deflection shows that these ions deflected at an angle of 10.0°. Under the same electric field, an unknown gaseous ion Z⁻ is deflected at an angle of 2.58°. What is the isotopic mass of Z?

In a particular experiment, a beam of ⁹Be²⁺ ions is deflected by an electric field through an angle of +10°. Which one of the following particles, when passed through the same electric field, will be deflected through an angle half the magnitude of ⁹Be²⁺?

Scientists have discovered the use of an isotope of lead, Pb, which can treat non-cancerous eye disorders. ²¹⁰Pb is an isotope of ²⁰⁷Pb. Which statement about these isotopes is correct?

Which statement about the electrons in a ground state carbon atom is correct?

The shape of each p orbital is represented as two lobes. How many electrons does Cu have in orbitals with four lobes?

The shape of each p orbital is represented as two lobes. How many 3d orbitals have four lobes?

An ion X²⁺ contains 24 protons. What is the electronic configuration of X³⁺?

Which particle contains the most number of unpaired electrons?

A cation G²⁺ is isoelectronic with PH₃. What is the ground state electronic configuration of G?

Which electronic configuration represents an atom of an element, at ground state, that forms a stable ion with a charge of +3?

Which of the following about calcium and copper is correct?

There are occupancies of another type of subshell, beyond the s, p, d and f. This would be a g subshell, which is predicted to be found in the 5th shell of an atom, that is, the 5g subshell.

How many electrons in the 5g subshell would the element of atomic number 122 be expected to have?

Element Z, nucleon number 31, forms an ion Z³⁻. Where is Z found in the Periodic Table?

The successive ionisation energies of the gaseous ion G⁺ are given in the table.

Which group in the Periodic Table does G belong to?

The table shows the fifth, sixth, seventh, eighth and ninth ionisation energies of an element in the third period.

Which element has these ionisation energy values?

Which of the following statements best explains why the first ionisation energy of argon is higher than that of sulfur?