TestUstad
Moderate

When an electron is added to Othen the energy change is expressed by:

Correct answer: A. Electron affinity

  • A. Electron affinity
  • B. Energy release
  • C. Energy absorption
  • D. Both options A and C are correct

Explanation

When an electron is added to an atom, the energy change associated with this process is known as the electron affinity. Electron affinity represents the energy released (or absorbed) when an atom in the gaseous phase gains an electron to form a negatively charged ion (anion). It is typically expressed in units of kilojoules per mole (kJ/mol) or electron volts (eV).For oxygen (O), the electron affinity is defined as the energy change when an electron is added to an oxygen atom in the gaseous state to form the oxygen anion (O^-). The electron affinity of oxygen is a negative value, indicating that energy is released when oxygen gains an electron.

Last updated

About s-Block and p-Block Elements

The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.

Practise s-Block and p-Block Elements

1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.

Start a free s-Block and p-Block Elements testAll s-Block and p-Block Elements MCQs

Exams that ask Chemistry questions like this

Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.

AKU Chemistry45 MCQsDUHS Chemistry45 MCQsETEA MDCAT Chemistry45 MCQsKMU Chemistry45 MCQsMDCAT Chemistry45 MCQsNUMS Chemistry40 MCQsECAT Chemistry30 MCQsETEA Engineering Admission Test Chemistry30 MCQsGIKI Chemistry30 MCQsNED Chemistry30 MCQsNET Chemistry30 MCQsPIEAS Chemistry30 MCQs

Related questions

2NaOH(aq) + Cl2(g) → NaCl + NaClO + H2O proceed at:

A compound 'X' on heating gives a colourless gas. The residue is dissolved in water to produce 'Y'. When CO₂ is passed through the aqueous solution of 'Y', it produces 'Z', which on gentle heating gives back 'X'. Compound 'X' is:

A elements are named as alkali metals because

A gas which burn with blue flame is:

A gas which burns with a blue flame is