the mass off a helium-4 atom is 6.64648 x10 e-24 g and each of its 2 electrons has a mass of 9.10939 x 10e-28 g. what fraction (or percent) of this atoms mass is contributed by its nucleus

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Trinidad TremblayLv2

13 Dec 2019

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The radius of a helium atom is 32pm and its mass is 6.55 x 10^-24g.What is the density of the atom in grams per cubiccentimeter?

Assume the nucleus is a sphere with volume =(4/3)pi r^3

Answer should be in g/cm^3

Chemistry help please! I don't know how to solve for atomic mass or density with and without electrons...Question is:

Determine the mass of one atom of each element (in units of grams):

Include Electrons Do Not Include Electrons

Mass of Chromium atom: _ _

Mass of Molybdenum atom: _ _

Mass of Tungsten atom: _ _

Determine the density of one atom of each element using the data in Table 1 below (in units of g mL ^-1):

Include Electrons Do Not Include Electrons

Density of Chromium atom: _ _

Density of Molybdenum atom: _ _

Density of Tungsten atom: _ _

Table 1:

Mass of Subatomic Particles (g)

Proton 1.672623 E-24

Neutron 1.674928 E-24

Electron 9.109387 E-28

Mass Number of Most Abundant Isotope Atomic Radius(pm)

Chromium 52 124.9

Molybdenum 98 136.2

Tungsten 184 137.0

Determine whether each of the following statements is true or false. If false, correct the statement to make it true: (a) The nucleus has most of the mass and comprises most of the volume of an atom. (b) Every atom of a given element has the same number of protons. (c) The number of electrons in an atom equals the number of neutrons in the atom. (d) The protons in the nucleus of the helium atom are held together by a force called the strong nuclear force.