## What is the mass number of an element that has 19 electrons 19 protons and 20 neutrons?

Hence, number of neutrons is 39 – 19 which is 20. Potassium-40 – It has 19 protons and atomic mass is 40.

What is the element with 20 protons and 20 neutrons?

calcium
The mass number of calcium which has 20 protons and 20 neutrons is. The mass number of calcium which has 20 protons and 20 neutrons is.

What element has a proton 20 and electron 20?

calcium (Ca)
For example, calcium (Ca) has an atomic number of 20. This means that all calcium atoms contain 20 protons. A neutral atom of calcium will also have 20 electrons.

### What element has a neutrons of 20?

In your case, you know that an atom of calcium, Ca , has 20 neutrons in its nucleus. This means that in order to get its mass number, all you need to know is how many protons are found in its nucleus.

What is the charge of an ion that has 20 protons and 18 electrons?

Ca2+
Ca2+ represents an ion with 20 protons and 18 electrons. A calcium atom has 20 protons and 20 electrons. The 2+ charge next to the symbol indicates a loss of two electrons: 20-2=18.

What element has 19 electrons and 21 neutrons?

This tells you that potassium has 19 protons and – since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element. This can also be found in the periodic table.

## What is the element with 20 protons?

calcium atom
A calcium atom has 20 protons.

What atom has 19 protons 21 neutrons and 19 electrons?

What element has an atomic number of 20?

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

### What isotope has 19 protons and 20 neutrons?

potassium
The element of potassium has the symbol K. The nucleus of an atom of potassium contains 19 protons and 20 neutrons.

What element has 19 as its number of protons?

– We have formulas to calculate Atomic Number and Mass Number of an element using only the number of protons, neutrons or electrons. – Atomic Number (Z) = No. of Protons (P) = No. of Electrons (E) in an atom. [Or, Z=P=E, you can simply remember ZPE] – Mass Number (A) = No. of Protons + No. of Neutrons in an atom. [Or, A=P+N, you can simply remember it as AP+N]

What element has 19 neutrons?

What element has a mass number of 36 and 19 neutrons? Chlorine 36 (Cl-36) is the chlorine isotope whose nucleus consists of 17 protons and 19 neutrons. It is a cosmogenic radioisotope of chlorine with a trace half-life of 301,000 years in the environment, in a ratio of about 7 × 10–13 to 1 with stable isotopes.

## How to find the number of neutrons in an element?

Get a periodic table of elements. The periodic table is a chart that organizes elements by their atomic structure.

• Find your element on the periodic table. The table orders elements by atomic number and separates them into three main groups: metals,non-metals,and metalloids (semi-metals).
• Locate the element’s atomic number.
• Which element has 19 protons and 1 valence electron?

Protons, Neutrons and Electrons of all the Elements: Shell Diagram: 1: Hydrogen has 1 proton, 0 neutron and 1 electron: 2: Helium has 2 protons, 2 neutrons and 2 electrons: 3: Lithium has 3 protons, 4 neutrons and 3 electrons: 4: Beryllium has 4 protons, 5 neutrons and 4 electrons: 5: Boron has 5 protons, 6 neutrons and 5 electrons: 6