What element has an atomic number of 19 and a mass number of 40?

Potassium-
Potassium-40 – It has 19 protons and atomic mass is 40.

What element has atomic number 19 and mass number 39?

The element potassium’s atomic number is 19. Its relative atomic mass is 39.098. How many protons occur in a potassium atom?

What isotope has 19 electrons and mass number 40?

Potassium-40 is composed of 19 protons 21 neutrons and 19 electrons. Traces of K-40 are found in all potassium and it is the most common radioisotope in the human body. K-40 is a radioactive isotope of potassium which has a very long half-life of 1.251×109 years and undergoes both types of beta decay.

What element atomic mass is 40?

The elements of the periodic table sorted by atomic mass

Atomic Mass Name chemical element number
85.4678 Rubidium 37
87.62 Strontium 38
88.9059 Yttrium 39
91.224 Zirconium 40

What element has an atomic number of 19?

Potassium
Potassium – Element information, properties and uses | Periodic Table.

What is the atomic number of 19?

K Potassium
The Elements, sorted by Atomic Number

Atomic Number Symbol Name
19 K Potassium
20 Ca Calcium
21 Sc Scandium
22 Ti Titanium

What element has a mass number of 40 and 18 protons?

Argon
Argon has the chemical formula Ar. Argon has 18 protons and 22 neutrons in its nucleus giving it an Atomic Number of 18 and an atomic mass of 40.

How many neutrons are in potassium 40?

twenty one neutrons
Potassium-40 has twenty one neutrons.

Which statement is correct for the element of proton number 19?

The element with atomic number 19 is K, and is thus present in group 1A.

What element has an atomic mass of 19?

The Elements, sorted by Atomic Number

Atomic Number Symbol Atomic Mass (amu, g/mol)
17 Cl 35.453
18 Ar 39.948
19 K 39.0983
20 Ca 40.08

What is the atomic number of 40?

Zirconium
Zirconium is a chemical element with the symbol Zr and atomic number 40.