**Question 20**: The atoms of the elements in Group 2 have the same:1. Mass number2. Atomic number3. Number of protons4. Number of valence electrons**Explanation**: In the periodic table, Group 2 elements, known as alkaline earth metals, have the same number of valence electrons. This group includes elements like beryllium, magnesium, and calcium, all of which possess two valence electrons. This characteristic affects their chemical properties and reactions. No graphs or diagrams are present in this image. **Question 18: Which particles are isotopes of each other?**Options:1. \(_1^1X\) and \(_1^3X\)2. \(_1^2X\) and \(_2^3X\)3. \(_2^2X\) and \(_4^4X\)4. \(_3^3X\) and \(_3^4X\)**Explanation:**Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Therefore, they have the same atomic number but different mass numbers. - In option **(1)** \(_1^1X\) and \(_1^3X\), both particles have the same atomic number (1), indicating they are isotopes of each other. The mass numbers (1 and 3) differ.- For other options, check if the subscript, representing the atomic number, is the same. If they are not, they are not isotopes.

Answered: 20. The atoms of the elements in Group…

20. The atoms of the elements in Group 2 have the same (1) mass number (2) atomic number (3) number of protons (4) number of valence electrons

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.

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**Question 18: Which particles are isotopes of each other?**

Options:

1. \(_1^1X\) and \(_1^3X\)
2. \(_1^2X\) and \(_2^3X\)
3. \(_2^2X\) and \(_4^4X\)
4. \(_3^3X\) and \(_3^4X\)

**Explanation:**

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Therefore, they have the same atomic number but different mass numbers.

- In option **(1)** \(_1^1X\) and \(_1^3X\), both particles have the same atomic number (1), indicating they are isotopes of each other. The mass numbers (1 and 3) differ.

- For other options, check if the subscript, representing the atomic number, is the same. If they are not, they are not isotopes.

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