0
A given atom of calcium has an atomic number of 20 and an atomic weight of 42 This atom has?
Wiki User
∙ 14y ago
22 neutrons.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Is the atomic number and the atomic weight the same?
No, the atomic number is the number of protons and electrons in a given element. The atomic weight is the weighted average of the isotopes in a natural environment.
How many protons are in calcium 40?
If you locate Argon (Ar) on the Periodic table, you will see that it has an atomic weight 39.95 which is rounded up to 40 (hence Ar-40.) The number, 18, located at the top of Argon is it's atomic number which is a fancy way of saying "number of protons." The atomic weight we were just talking about is the sum of the protons+neutrons. Since we are given the atomic weight and the atomic number (remember "number of protons"): Atomic weight + Atomic number = Number of neutrons 39.95 18 22 Finding the number of electrons is the simplest part. In any atom (assuming that the atom's charge is balanced,) the number of electrons equals the number of protons. You will in most cases be assuming that the # of electrons equal the # of protons. Don't scare yourself and make it harder than it seems
What is the scientific notation for calcium?
Scientific notation is a way of writing numbers that are too big or too small to be conveniently written in decimal form.The symbol for calcium is Ca. The atomic number is 20. The atomic weight is 40.078 While there are some very small numbers associated with calcium, they are given in small units so the numbers are manageable.
What is the atomic weight used for?
You can use atomic weight to calculate the number of atoms in a given sample of an element. # g of sample element x (6.02 x 1023 / atomic weight in grams) = # of atoms
What does the atomic number on the periodic table tell?
The atomic number represents the number of protons. The atomic mass represents the number of protons + neutrons.
How can the atomic atom be used to determine the number of neutrons?
The atomic weight of any given isotope of an element is the result of the protons and the neutrons. The number of protons is the same as the atomic number, so if you subtract the atomic number from the atomic weight, voila, there is the number of neutrons. Bear in mind that elements have more than one isotope, and each isotope has a different number of neutrons. So the atomic weight is the result of a mixture of isotopes that appear in nature.
Protons electrons and neutrons in any given atom?
The atomic number of a chemical element is equal to the number of electrons or protons. The number of neutrons = Atomic weight of an isotope (rounded) - atomic number of the element (or the number of protons)
How can you determine which isotope of a given atom is the most common?
round the atomic weight to the nearest whole number.
What is the atomic number in a given element equivalent to?
The atomic number in a given element is equivalent to the number of protons in the element.
What is a atomic number in a element?
The atomic number of an element refers to the number of protons in the nucleus of the atom of that element, and is unique to each element. The atomic weight is the weight of an atom of the element compared with the weight of a single proton, and consists of number of protons and neutrons in the nucleus of the atom of that element, and different atoms of the same element can have different numbers of neutrons, and therefore more than one atomic weight: it is usually given as an average. the atomic number on an element is simply the number of protons and electrons in the element. however, it is not the total number of them.
How was the atomic number and the atomic mass determined?
the atomic number is determined by looking above top of the letter[s] on an element on the periodic table of elements
Number of protons in an atoms nucleus?
This is given by the atomic number of the element
