# What Element Has 81 Protons And 123 Neutrons?

How many neutrons are in hydrogen? Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. The isotopes of hydrogen have, respectively, mass numbers of one, two, and three. Their nuclear symbols are therefore 1H, 2H, and 3H. The atoms of these isotopes have one electron to balance the charge of the one proton.

## what is the mass number of an atom that contains 81 protons 129 neutrons and 81 electrons?

NameThallium
Atomic Mass204.3833 atomic mass units
Number of Protons81
Number of Neutrons123
Number of Electrons81

What is atomic mass number? The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.

## what element has an atomic mass of 81?

Thallium

How do you find electrons in an element? The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

## how much is thallium worth?

Commercial thallium metal (99%) costs about \$40/lb.

How do you find electrons in an ion? The charge on the ion tells you the number of electrons. If the charge is positive, subtract that number from the atomic number to get the number of electrons. You have more protons. If the charge is negative, add the amount of charge to the atomic number to get the number of electrons.

### How many protons and neutrons are in thallium?

81

How do you figure out neutrons? Take note that the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass). So, to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number.

### Where is thallium commonly found?

Thallium is found as a mineral in the elements crooksite, lorandite and hutchinsonite. It's also found as a trace element in iron pyrite and obtained from this ore by roasting the mineral. Small amounts of thallium are found in manganese nodules on the ocean floor.

### How do you find the number of electrons in an isotope?

Understand that isotopes of an element have different mass numbers but the same number of protons. Using the Periodic Table, find the atomic number of the element. The atomic number equals the number of protons. In a balanced atom, the number of electrons equals the number of protons.

### What is the 100th element?

Fermium is the 100th element of the periodic table of elements.

### What is Nihonium used for?

Origin of Nihonium RIKEN is a heavy-ion facility in Japan that contains a special linear accelerator, a machine that is used to produce particles. In Japan, the type of accelerator that is used is called a cyclotron, which spins a particle and aims it at a target.

### Who discovered Nihonium?

Nihonium was discovered on August 12, 2012 by Kosuke Morita's RIKEN collaborative team in Japan. It was the first chemical element ever discovered in Asia.

#### What does thallium do to the body?

Thallium can affect your nervous system, lung, heart, liver, and kidney if large amounts are eaten or drunk for short periods of time. Temporary hair loss, vomiting, and diarrhea can also occur and death may result after exposure to large amounts of thallium for short periods.

#### What is Crooksite?

Named from the Greek word meaning “green twig” (a bright green line is present in the element's spectrum), thallium is a very soft, bluish-white metal that can be cut with a knife. Thallium is used in photocells, infrared detectors, solders, and glass that melts at low temperatures.

#### What are 3 uses for thallium?

Common applications of thallium include, but are not limited to: Acousto-optic laser equipment. A catalyst for organic reactions. HIgh-temperature superconductors. Radioisotopes. Detection of gamma radiation. Specialized temperature-extreme glasses. Low-temperature thermometers. Infrared light-sensitive photocells.

#### Does the human body use thallium?

The human body absorbs thallium very effectively, especially through the skin, the breathing organs and the digestive tract.

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