False as a generalization but true for some isotopes. The atomic number is the number of protons in a nucleus, which may coincidentally be the same as the number of neutrons but is not required to be.
True
This would be false. The atomic number is equal to the number of protons and the neutrons are the number you add to protons to equal the mass number (to find round the atomic weight).
The expression true or false atoms is not correct. All atoms are true entities. Each isotope of an element has a different number of neutrons; the number of protons and electrons is constant for all the isotopes of an element.
A piece of pure Iron contains only one type of atom (Iron atoms) but there is more than one atom in it.
False
No they about the same. The mass of a proton is 1.6726x10^-27kg or 1.0073U and the mass of a neutron is 1.6749x10^-27kg or 1.0087U.
false
This would be false. The atomic number is equal to the number of protons and the neutrons are the number you add to protons to equal the mass number (to find round the atomic weight).
False. Number of neutrons.
false
False. The number of electrons always equals the number of protons for an element and this is called the atomic number of an element. The number of neutrons in an element depends on other factors and varies by element and the same element can have different versions with a different number of neutrons. Each version is called an isotopes. The sum of the protons and neutrons in an atom is called the atomic weight. Hydrogen has three isotopes with 0, 1, or 2 neutrons, with atomic weights 1,2, 3). Isotopes with 1 or 2 neutrons are extremely rare. Carbon has four isotopes. It can have 5, 6, 7, or 8 neutrons (atomic weights 11, 12, 13, 14). We commonly refer to different isotopes by its name and weight as in carbon-11, carbon-12, carbon-13, carbon-14. Carbon-12 is common and everywhere. the others are very rare. Carbon-11 and carbon-14 are considered unstable and tend to brake down into other elements over a period of time releasing energy as it happens. This is called radioactivity.
False. An atom is neutral if it has an equal number of protons and neutrons
Isotopes differ in the number of neutrons. All atoms are neutral - they always contain the same number of protons (positive) as electrons (negative). If they lose or gain electrons, they become ions. If they lose or gain protons (as in radioactive decay), they become a different element. An element is defined by its atomic number, which is the number of protons. Atoms may differ in their atomic mass. The difference is due to differing numbers of neutrons. The atomic mass on the periodic chart is the proportional average of all the naturally occurring isotopes. To determine how many neutrons in an atom, subtract the atomic number from the atomic mass.
1914 Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass.
no. an atom is made up of protons neutrons and electrons. protons have a charge of plus one electrons have a charge of minus one neutrons have no charge. therefore the number of protons and electrons must be equal (balancing the charges) for the atom to be neutral. ;)
False, because the only element with the highest Electronegativity is hydrogen and the atomic number is 1.
False; the atomic number is the total number if protons in the nucleus only.
false