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Which two elements have an atomic mass less than twice their atomic number?
Elemental hydrogen and helium have atomic masses less than twice their atomic numbers.
How do you know the number of protons electrons and neutrons in the 1st 20 elements?
Look at the periodic table.The bottom number on an element is the number of protons. The number of electrons will be the same. Subtract the bottom number from the top number to get the number of neutrons. e.g: 103 Rh 45 Protons= 45 Electrons= 45 Neutrons= 58 (103-45)
What does the mass number indicates in an element?
The atomic number (or mass number) is the proton number (the number of protons in the nucleus) added to the number of neutrons in the nucleus. The atomic mass is, for stable isotopes, roughly twice that of the proton number although the higher the proton number is the more the number of neutrons increases but this is most apparent in the very heavy elements. It is mainly useful in the use of decay equations as the neutrons lead to the stability of the atom so, when the atomic mass is above or below normal the atom can become unstable and is likely to undergo radioactive decay.
Are most atoms their mass number is the same as their atomic number?
No. In most atoms the mass number is at least twice the atomic number. A mass number that is the same as the atomic number would indicate a nucleus with no neutrons. Such a nucleus would be highly unstable except in the case of the hydrogen-1 nucleus, which consists of a single proton. In most other stable nuclei there are at least as many neutrons as their are protons. The mass number is the sum of the number of protons and the number of neutrons.
How many kinds of atoms are there?
Let's do the math.There are currently about 120 known chemical elements. On average, each element has around three isotopes (where the nucleus has the same number of protons, but a different number of neutrons).So a quick and dirty number would be that there are around 300-350 unique atomic nuclei. Or possibly twice that, if you consider the antimatter versions of each.
Which two elements have an atomic mass less than twice their atomic number?
Elemental hydrogen and helium have atomic masses less than twice their atomic numbers.
Its atomic number is twice that of aluminum?
The element with an atomic number twice that of aluminum (13) is magnesium, which has an atomic number of 12.
Which elements atoms have twice the number of protons in oxygen?
Sulfur.
What number atomically links nickel with silicon approximately?
The atomic number of nickel (28) is twice that of silicon. (Atomic number is the number of protons in the nucleus and is equal to the number of electrons in the neutral atom.
How do you know the number of protons electrons and neutrons in the 1st 20 elements?
Look at the periodic table.The bottom number on an element is the number of protons. The number of electrons will be the same. Subtract the bottom number from the top number to get the number of neutrons. e.g: 103 Rh 45 Protons= 45 Electrons= 45 Neutrons= 58 (103-45)
What does the mass number indicates in an element?
The atomic number (or mass number) is the proton number (the number of protons in the nucleus) added to the number of neutrons in the nucleus. The atomic mass is, for stable isotopes, roughly twice that of the proton number although the higher the proton number is the more the number of neutrons increases but this is most apparent in the very heavy elements. It is mainly useful in the use of decay equations as the neutrons lead to the stability of the atom so, when the atomic mass is above or below normal the atom can become unstable and is likely to undergo radioactive decay.
The atomic number of neon is 10 the atomic number of calcium is 20 compared with a mole of neon a mole of calicum contains?
A mole of any element contains Avogadro's number of atoms, which is approximately 6.022 x 10^23 atoms. So, a mole of calcium (atomic number 20) will contain twice the number of atoms as a mole of neon (atomic number 10), as the atomic number corresponds to the number of protons in an atom.
Why is it important that sex cells have exactly the number of chromosomes as the body cells?
The DO NOT "have exactly the number of chromosomes as the body cells", they have 1/2 that number. This is so that when two sex cells come together to form an embryo, the cells of that embryo have exactly the same number of chromosomes as the body cells of the two parents and not twice that number.
What mass of gold contains twice as many atoms as 2.74g of silver?
The gram atomic mass of silver is 107.868 and that of gold is 196.967. Equal numbers of gram atoms of different elements contain equal numbers of atoms. Therefore, the mass of gold required to contain twice as many atoms as 2.74 g of gold is (2 X 2.74 X 196.967)/107.868 or 10.0 g of gold, to the justified number of significant digits.
Which element is thousands time greater than uranium?
It is not clear what "greater" means. In terms of atomic number (number of protons in the nucleus) there is not even an element which is twice as great.
How many of the first twenty elements in the periodic table have isotopes?
19 ------------------------------------------- Actually all elements have isotopes. Isotopes are atoms that have different amount of neutrons. If you ever notice the atomic mass of an atom, it is the average atomic mass of all isotopes. If an atom had no isotope then that number would be an integer.
Are most atoms their mass number is the same as their atomic number?
No. In most atoms the mass number is at least twice the atomic number. A mass number that is the same as the atomic number would indicate a nucleus with no neutrons. Such a nucleus would be highly unstable except in the case of the hydrogen-1 nucleus, which consists of a single proton. In most other stable nuclei there are at least as many neutrons as their are protons. The mass number is the sum of the number of protons and the number of neutrons.
