Answer:
12
Explanation:
23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.
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1. d.4.125 x 10²⁴ atoms
2. c. 487.73 g
<h3>Further explanation </h3>
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1. 7 moles of phosphorus, so n=7, then number of atoms :
2. 2.5 moles of Pt, so n=2.5, the mass of Pt(MW=195,084 g/mol) :
Answer:
Picture D represents the only possible option as the Picture D rearranges the atoms whereas A, B, and C did not. Option D
Explanation:
We can see in the pictures A, B and C the atoms are not arranged properly if we keep the fundamental image in view. By comparing all the images you will observe how the atoms in the fundamental image are differently represented in image A, B and C. Also the fundamental image have 10 atoms whereas all the option except D varies the number of atoms
Valence must be considered and whether the substance is an atom or molecule, for example: 2Na + Cl2=>2 NaCl