262107BHJust imagine the 262 is directly above the 107, the upper number is the atomic mass number which is the sum of the number of protons and neutrons while the lower number is the atomic number which is just the number of protons.
91
The difference between mendelevium-256 and mendelevium-258 lies in their atomic mass, with mendelevium-256 having 256 nucleons (protons and neutrons) and mendelevium-258 having 258 nucleons. This means that mendelevium-258 has two more neutrons in its nucleus compared to mendelevium-256.
Atomic radius in group 4:- titanium=140 pm- zirconium=155 pm- hafnium=155 pm
# of protons:107 # of electrons:107 # of neutron:155
The number of neutrons in the nucleus of an atom is always the difference between the mass number of the atom and the atomic number of the atom. Therefore, in this instance, there are (155 - 63) or 92 neutrons in the atom.
262107BHJust imagine the 262 is directly above the 107, the upper number is the atomic mass number which is the sum of the number of protons and neutrons while the lower number is the atomic number which is just the number of protons.
91
The atom of the isotope Md-256 has 101 protons, 101 electrons and 155 neutrons.
An atom with 60 protons would be the element neodymium (Nd), which has atomic number 60. A mass number of 155 suggests it has 95 neutrons (155 - 60). Neodymium-155 is a stable isotope, so the atom would be stable.
europium's atomic number is 63, it's mass (in amu's [atomic mass units]) is 152, rounded. the atomic number = the number of protons, so europium has 63 protons. the number of protons = the number of electrons, so there are 63 electrons in a europium atom. the mass= protons + neutrons, therefore neutrons = mass - protons. this would be 152 - 63 = 89 there are 89 neutrons in a europium atom. p+: 63 n: 89 e-: 63 hope i helped! ^.^
The difference between mendelevium-256 and mendelevium-258 lies in their atomic mass, with mendelevium-256 having 256 nucleons (protons and neutrons) and mendelevium-258 having 258 nucleons. This means that mendelevium-258 has two more neutrons in its nucleus compared to mendelevium-256.
Atomic radius in group 4:- titanium=140 pm- zirconium=155 pm- hafnium=155 pm
The atomic weight of sulfur is about 32.066. Therefore, 155 grams of sulfur contains 155/32.066 or about 4.83 gram atomic masses of sulfur to the justified number of significant digits. Each such gram atomic mass contains Avogadro's number of atoms, for a total of 4.83 X 6.022 X 1023 or 2.91 X 1024 atoms.
To convert pounds to kilograms, divide the weight in pounds by 2.205. So, if you weigh 155 pounds, your mass is approximately 70.3 kilograms.
The atom of the isotope Md-256 has 101 protons, 101 electrons and 155 neutrons.
Density = mass/volume = 155/125 = 1.24 g/cm3.