Chemistry, 01.08.2019 11:20 reganjones89

How to tell how many protons neutrons and electrons are in an element?

Answers: 1

Show answers

Answers

Use your periodic table to determine the number of protons. The number of protons in an atom defines its elemental identity. For example, any atom with 11 protons is called sodium, no matter the number of electrons or neutrons that it carries. You can determine the number of protons in an atom by looking at the atomic number, which is just above the atomic symbol on the periodic table. For example, if you want to know the number of protons for magnesium, then you look for its atomic symbol, Mg, on the periodic table, and just above it you will find the atomic number, 12, which is equal to the number of protons in magnesium.

Use the number of protons to determine the number of electrons. In an atom with no charge, the number of electrons is equal to the number of protons. For example, an uncharged magnesium atom will have 12 electrons. If the atom carries a positive or negative charge, add one electron to the original number of electrons for every negative charge, or subtract one electron from the original number of electrons for every positive charge. For example, if you have a magnesium ion with a +2 charge, then you must subtract two electrons from the original 12, giving you 10 electrons. Ions are the only forms of atoms in which the number of electrons does not match the number of protons.

Subtract the number of protons from the atomic mass to determine the number of neutrons. Different isotopes have different numbers of neutrons. Look at the atomic mass of the isotope, which will be listed after the name of the isotope or in the upper left corner of the atomic symbol. Subtract the number of protons for that element from the atomic mass to get the number of neutrons. For example, carbon-13 is a carbon isotope with an atomic mass of 13. Using the periodic table you can determine that carbon has six protons. Subtract six from 13 to get 7 neutrons present in carbon-13

I hope it helped you!

Answer from: Quest

The heat added represents an energy change.

Answer from: Quest

Nuclear will be the answer

Another question on Chemistry

Chemistry, 22.06.2019 03:30

Predict the products butane (c4h10) + oxygen —>

Answers: 1

Answer

Chemistry, 22.06.2019 06:10

56.16 gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from parents to offspring. this is an example of pls

Answers: 1

Answer

Chemistry, 22.06.2019 19:00

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.

Answers: 1

Answer

Chemistry, 22.06.2019 19:30

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?