/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 101 The atomic number for an atom co... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 2: Problem 101

The atomic number for an atom containing 20 protons, 21 neutrons, and 20 electrons is

Short Answer

Expert verified
The atomic number is 20.

Step by step solution

01

Identify the number of protons

The atomic number of an element is defined by the number of protons in its nucleus. In the given problem, the atom contains 20 protons.
02

State the atomic number

Since the atomic number is directly equal to the number of protons in the nucleus, and the given atom has 20 protons, the atomic number of this atom is 20.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

protons
Protons are subatomic particles found in the nucleus of an atom. They carry a positive charge and are counted to determine the atomic number of an element. Each element has a unique number of protons in its nucleus, which distinguishes it from other elements. Similarly charged protons repel each other, but they are held together in the nucleus by a strong force called the nuclear force.
To sum up:
  • Protons are positively charged particles.
  • They are located in the nucleus of an atom.
  • The number of protons determines the atomic number of an element.
atomic structure
Atomic structure refers to the arrangement of subatomic particles in an atom. An atom consists of three main subatomic particles: protons, neutrons, and electrons. Protons and neutrons are located in the nucleus at the center of the atom, while electrons orbit the nucleus in various energy levels or shells. The attractive force between the positively charged protons and negatively charged electrons keeps the electrons in motion around the nucleus.
Key points to remember about atomic structure:
  • Protons and neutrons are in the nucleus.
  • Electrons orbit the nucleus in energy levels.
  • The nucleus contains most of the atom's mass.
element identification
Element identification is the process of determining an element based on its atomic number, which is equal to the number of protons in its nucleus. The periodic table is a useful tool for identifying elements, as it arranges them in order of increasing atomic number. Each element has a unique atomic number and is represented by a chemical symbol. For example, the element with 20 protons (atomic number 20) is calcium, represented by the symbol Ca.
Important points:
  • The atomic number identifies an element.
  • The periodic table helps to find elements based on their atomic numbers.
  • Each element has a unique chemical symbol.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Ozone \(\left(\mathrm{O}_3\right)\) is produced in the upper atmosphere when oxygen gas \(\left(\mathrm{O}_2\right)\) absorbs high-energy sunlight. Which equation correctly describes this reaction? A. \(\mathrm{O}_2+\) energy \(\rightarrow \mathrm{O}_2\) B. \(\mathrm{O}_2+\) energy \(\rightarrow 2 \mathrm{O}_2\) C. \(2 \mathrm{O}_2+\) energy \(\rightarrow 3 \mathrm{O}_2\) D. \(3 \mathrm{O}_2+\) energy \(\rightarrow 2 \mathrm{O}_3\)

Kim put a cup of dry macaroni pasta into a pot of boiling water on the stove. After a minute, she noticed that the pieces of macaroni were rising and falling through the water. What type of heat transfer makes the macaroni do this? A. conduction only B. conduction and convection C. radiation and conduction D. convection only

At what temperature on the Fahrenheit scale does water boil? A. \(+100^{\circ}\) B. \(+150^{\circ}\) C. \(+212^{\circ}\) D. \(+273^{\circ}\)

The following chemical equation takes place in the presence of specific heat. $$ \mathrm{CaCO}_3(\mathrm{~s}) \rightarrow \mathrm{CaO}(\mathrm{s})+\mathrm{CO}_2(\mathrm{~g}) $$ This reaction is an example of a A. redox reaction B. combination reaction C. decomposition reaction D. displacement reaction

Which of the following demonstrates a change in physical properties? A. wood burning in a campfire B. a banana turning brown C. a steak cooking in a frying pan D. a glass being shattered by a flying dart
See all solutions

Recommended explanations on Physics Textbooks

Particle Model of Matter

Read Explanation

Electric Charge Field and Potential

Read Explanation

Measurements

Read Explanation

Translational Dynamics

Read Explanation

Force

Read Explanation

Famous Physicists

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.