Atomic Theory and Electron Configuration Quiz

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Questions and Answers

Which of the following best describes Democritus's view on matter?

Matter is continuously divisible without limit.

Matter is a manifestation of a universal, spiritual substance.

Matter is composed of a combination of fire, air, water, and earth.

Matter is composed of tiny, indestructible particles called 'atomos'. (correct)

What was the primary basis for Democritus's atomic theory?

Detailed experimental observations.

Mathematical calculations of particle sizes.

Philosophical speculation and reasoning. (correct)

Analysis of chemical reactions.

Which philosophers believed that matter is continuously divisible?

Democritus and Plato.

Democritus and Aristotle.

Plato and Aristotle. (correct)

Only Democritus held this view

What does 'atomos' mean, according to Democritus?

Indivisible. (A) Signup and view all the answers

Approximately how long after Democritus's proposal was an atomic theory widely accepted?

2000 years (A) Signup and view all the answers

What is one key difference between Democritus' view of an atom and the modern understanding of an atom?

Democritus believed atoms were indestructible, which is now known to be untrue through nuclear reactions. (B) Signup and view all the answers

What is the primary contribution of John Dalton in the context of atomic theory?

He developed an atomic theory that gained widespread acceptance. (C) Signup and view all the answers

What do all of the substances mentioned in the start-up activity have in common?

They are all composed of different building blocks. (C) Signup and view all the answers

What does the symbol $4d^6$ represent in the context of electron configuration?

Six electrons in the d orbital of the fourth energy level. (B) Signup and view all the answers

Which of the following is the correct electron configuration for Vanadium (V), given that its atomic number is 23?

$1s^22s^22p^63s^23p^64s^23d^3$ (C) Signup and view all the answers

Which set of quantum numbers is unacceptable for an electron in an atom?

$(1, 0, \frac{1}{2}, \frac{1}{2})$ (D) Signup and view all the answers

How many p electrons are present in a Nitrogen (N) atom, given that its atomic number is 7?

3 (A) Signup and view all the answers

What is the abbreviated electron configuration for Magnesium (Mg), which has an atomic number of 12?

[Ne] $3s^2$ (C) Signup and view all the answers

What primary characteristic is used to group elements in the modern periodic table?

Outer-shell electron configurations (D) Signup and view all the answers

What does the period number of an element in the periodic table indicate?

The value of n for the outermost or valence shell (C) Signup and view all the answers

Which term describes an element that possesses properties of both metals and non-metals?

Metalloid (B) Signup and view all the answers

Based on the type of subshell being filled, elements can be divided into what three categories?

Representative, transition, and inner transition (B) Signup and view all the answers

What general trend is observed in the size of elements as you move across a period from left to right?

The size of elements decreases. (C) Signup and view all the answers

Why are elements in Group 18 (VIIIA) known to be the least reactive?

They have a complete outer shell of electrons. (C) Signup and view all the answers

What is the primary reason why the size of atoms does not increase uniformly with increasing atomic number?

Shielding and effective nuclear charge variations. (D) Signup and view all the answers

How many groups and periods are there in the modern periodic table?

18 groups and 7 periods (D) Signup and view all the answers

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Study Notes

Chemistry Grade 11 Textbook

This Ethiopian chemistry textbook is for grade 11 students.
It includes the periodic table, with atomic numbers and weights.
It covers topics like atomic structure, chemical bonding, the states of matter, chemical kinetics, equilibrium, organic compounds, and the modern periodic table.

Textbook Care Instructions

Cover the book with protective material (plastic, newspaper, or magazines).
Keep the book in a clean, dry place.
Handle the book with care, especially when passing it to another person.
Use a piece of paper or cardboard as a bookmark.
Do not write or cut out any pictures within the book.

Table of Contents (Partial)

Unit 1: Atomic Structure and Periodic Properties of the Elements
- Introduction to atomic structure
- Dalton's atomic theory and postulates
- Modern atomic theory and postulates
- Laws of chemistry: conservation of mass, definite proportions, and multiple proportions
- Early experiments to characterize the atom
  - Cathode rays and the discovery of the electron
  - Radioactivity and the discovery of the nucleus
- Make-up of the nucleus: subatomic particles (protons, neutrons, electrons)
- Isotopes and atomic mass
- Electromagnetic radiation and atomic spectra
  - Electromagnetic waves and their characteristics
  - Quantum theory and the photon
  - Photoelectric effect
  - Atomic spectra and the Bohr model of the hydrogen atom, calculation of the energy emitted during a transition between two energy levels
- The wave-particle duality of matter and energy
- Quantum mechanical model of the atom
  - Heisenberg's uncertainty principle, quantum numbers, shapes of atomic orbitals
- Electronic configurations and orbital diagrams
Unit 2: Chemical Bonding
Unit 3: Physical States of Matter
Unit 4: Chemical Kinetics
Unit 5: Chemical Equilibrium
Unit 6: Some Important Oxygen-Containing Organic Compounds

Additional Information

The textbook is published by the Federal Democratic Republic of Ethiopia, Ministry of Education
It was printed by Gravity Group Ind LLC in the United Arab Emirates.
The book has a barcode and ISBN.
Various universities collaborated with the ministry in developing the textbook.
The textbook was published in August 2023.

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Description

Test your knowledge of Democritus's theories and the development of atomic theory. This quiz explores concepts from ancient views on matter to modern electron configuration, including key contributions from philosophers and scientists. Perfect for students studying chemistry concepts and atomic structure.