No. There are different isotopes of lithium which have different numbers of neutrons and thus different masses. There are two stable isotopes of lithium: Lithium-6 with 3 neutrons and Lithium-7 with 4 neutrons.
All the lithium atoms contain the same number of protons.
This atom has three neutrons. The atomic mass number is the sum of the protons and neutrons. All atoms of the same element have the same number of protons (lithium has three), so the neutrons have to account for the rest of the mass. 6 (the mass number)-3 (the number of protons in a lithium atom)=3. So this atom must have three neutrons.
All lithium atoms (ions or neutral) have 3 protons.
No, different samples of an element can have varying atomic masses due to the presence of isotopes. Isotopes are atoms of the same element with different numbers of neutrons, leading to different atomic masses.
All nickel atoms have 28 protons in their nucleus, making nickel an element with atomic number 28. They also have a total of 28 electrons in their electron cloud, following the principle of charge neutrality. Additionally, nickel atoms have the same atomic mass of around 58.71 atomic mass units.
All the lithium atoms contain the same number of protons.
All lithium atoms will have the same number of protons (3) but can have different numbers of neutrons, resulting in different isotopes of lithium. Electrons are the same for a neutral lithium atom (3 electrons), but ions of lithium can have a different number of electrons.
This atom has three neutrons. The atomic mass number is the sum of the protons and neutrons. All atoms of the same element have the same number of protons (lithium has three), so the neutrons have to account for the rest of the mass. 6 (the mass number)-3 (the number of protons in a lithium atom)=3. So this atom must have three neutrons.
He concluded that all atoms of an element have same mass and identical chemical and physical properties.
yes.
It is not true !!
All atoms contain protons, neutrons and electrons.
Lithium-6 and lithium-7 are two different isotopes of lithium. All lithium atoms have 3 protons, but they may have different numbers of neutrons. Lithium-6 has 3 neutrons ans lithium-7 has 4 neutrons.
The protons in their nuclei.
All lithium atoms (ions or neutral) have 3 protons.
Atoms with the same atomic number are all atoms of the same element. However, if the atoms have different molecular weights, they are isotopes of the same element.
The mass spectrometer was used to discover that not all atoms of neon have the same mass. This instrument separates and measures atoms based on their mass-to-charge ratio, allowing scientists to identify isotopes of elements like neon that have different masses.