question Which element has the electron configuration 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s

Chemistry

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹?

A. Francium
B. Radium
C. Actinium
D. Radon

Francium has this electron configuration.

A chemical reaction that absorbs heat from the surroundings is termed:

A. Endothermic
B. Exothermic
C. Combustion
D. Redox

Which of the following is a metalloid?

A. Boron
B. Bromine
C. Barium
D. Bismuth

The reaction A + B → AB is an example of a:

A. Synthesis
B. Decomposition
C. Single displacement
D. Double displacement

Which method involves the separation of ions based on their mobility in a buffer solution under the influence of an electric field?

A. Ion chromatography
B. Gas chromatography
C. Liquid chromatography
D. Thin-layer chromatography

What is the IUPAC name for CH₃COCH₃?

A. Acetone
B. Propanone
C. Butanone
D. Ethanal

The process of nuclear fission involves the:

A. Splitting of a large nucleus
B. Fusion of small nuclei
C. Emission of alpha particles
D. Absorption of neutrons

What is the IUPAC name for CH₃CH₂COCH₂CH₃?

A. Butanone
B. Pentanone
C. Hexanone
D. Propanone

What is the term for a bond formed by the attraction between oppositely charged ions in a crystal lattice?

A. Ionic
B. Covalent
C. Metallic
D. Polar

Which of the following is an example of a weak acid?

A. Acetic acid (CH₃COOH)
B. Hydrochloric acid (HCl)
C. Sulfuric acid (H₂SO₄)
D. Nitric acid (HNO₃)

The element with the highest atomic number is:

A. Oganesson
B. Radon
C. Francium
D. Radium