1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
aleksklad [387]
3 years ago
15

An atom with 20 protons and 20 electrons 20 neutrons is arranged according to?

Chemistry
1 answer:
Svetradugi [14.3K]3 years ago
3 0
Quick Answer:
Calcium has 20 protons and 20 neutrons.This element is number 20 on the Periodic Table of the Elements and has an atomic weight of 40.078.


Long Answer:
The easiest way to determine the number of protons in an element is to look at its atomic number. The atomic number is printed above the element's symbol on the periodic table. Calcium has an atomic number of 20, so it has 20 protons.

Finding the number of neutrons in an element is slightly more difficult. The number of neutrons present corresponds to the element's mass number less the number of protons in the element. Rounding an element's atomic weight, which is listed below the element on the periodic table, is the best way to find the element's mass number.

Calcium's atomic weight of 40.078 rounds to a mass number of 40. Subtracting 20 from 40 yields a result of 20. This means an atom with 20 protons and 20 neutrons must be an atom of calcium.

In some cases, calcium does not have 20 neutrons. The element has several different isotopes, which are atoms of the same element that have different numbers of neutrons. Some calcium isotopes are stable, but others decay over time. Ca-49 has a half-life of just 8.7 minutes, while Ca-41 has a half-life of 103,000 years.

You might be interested in
Determine where to dispose of each type of waste.
sattari [20]

Syringe tips and titrant solution in a container,  unused solid reagent in the manufacturer's container and  broken flask in the cardboard box.

Syringe tips are dispose into the disposal containers present in the lab or hospitals.  Unused solid reagent is dispose in the manufacturer's container and then label the container with a hazardous waste tag so that people can't use it and stay away from it.  

Broken flask is dispose in the cardboard box or a container.  Titrant solution can also be dispose by placing in a container which is leak proof and closed the opening tightly so that it can't pollute and damaged the outside world.

Learn more: brainly.com/question/24610949

4 0
3 years ago
Read 2 more answers
In the reaction __S+3O2→2SO3, what coefficient should be placed in front of the S to balance the reaction?
AleksAgata [21]

Answer:

2

Explanation:

because on the product side you have 2 sulfurs so you need 2 on the reactant side.

7 0
3 years ago
What is the total energy required to break all the bonds in 1 mol propanol,<br> C3H8O?
USPshnik [31]

Answer:

The total energy to break all the bonds in 1 mole of 1-propanol, C₃H₈O, is 4411 kJ/mol

Explanation:

We note that propanol, C₃H₈O is also known as 1-propanol is written as follows;

CH₃CH₂CH₂OH which gives

CH₃-CH₂-CH₂-OH

Hence, the total number of bonds are;

C-H Bonds = 3 + 2 + 2 = 7

C-O Bonds = 1

O-H Bond = 1

C-C Bonds = 2

The bond energies are as follows;

C-H Bonds = 413 kJ/mol

C-O Bonds = 358 kJ/mol

O-H Bond = 468 kJ/mol

C-C Bonds = 347 kJ/mol

Energy required to break the bonds in 1-propanol is therefore;

C-H Bonds = 413 kJ/mol × 7 = 2,891 kJ/mol

C-O Bonds = 358 kJ/mol × 1 = 358 kJ/mol

O-H Bond = 468 kJ/mol × 1 = 468 kJ/mol

C-C Bonds = 347 kJ/mol × 2 = 694 kJ/mol

The total energy to break all the bonds in 1 mole of 1-propanol = 4411 kJ/mol.

8 0
4 years ago
What is the density of the object if it weigh 389.27g and has volume of 832.92cm3
ExtremeBDS [4]

The density of the object is 0.467 36 g/cm³.

The mass of the object is 389.27 g.

The volume of the object is 832.92 cm³.

Density = mass/volume = 389.27 g/832.92 cm³ = 0.467 36 g/cm³

7 0
3 years ago
Directions. Carefully review the question. Use the following choices to answer 1 - 10.
IceJOKER [234]
1.c 2.d 3.b 4.a 5.a 6.a 7.b 8.b 9.d 10.
7 0
3 years ago
Other questions:
  • What does it mean for a chemical equation to be balanced?
    15·2 answers
  • PLZ HELP WILL MARK BRAINLIEST
    13·1 answer
  • __?__ is when cells divide. *
    13·2 answers
  • The Central value of the set of observation is called.​
    10·1 answer
  • 0.03mol of element Y combines with 762g of iodine to produce an iodide salt. State the empirical formula of the iodide salt​
    5·1 answer
  • An element is defined as a substance that is composed of only one type of atom. True or false?.
    10·2 answers
  • Red lights on a traffic light have a frequency of 4.3 X 10^15 Hz. What is the red light’s wavelength in meters? (Speed of light
    14·1 answer
  • How many protons and neutrons are in an atom of ^249 Bk?
    6·1 answer
  • When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution. Write only one net ionic equ
    10·1 answer
  • Pls help A student studies the effect of an object's height on its amount of gravitational energy. This graph summarizes the dat
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!