Answer:
²³⁵₉₂U
Explanation:
The nuclear symbol of the nuclei is ²³⁵₉₂U.
The uranium nuclei has;
mass number = 235
atomic number = 92
To write the structure of the atom;
The subscript before the symbol of the atom is the atomic number
The superscript is the mass number
So;
²³⁵₉₂U is the symbol of the nuclei.
Answer:
The heavier isotope is 48.2 % (option d)
Explanation:
Step 1: Data given
Atomic weight of silver = 107.868 amu
Isotopes of silver:
107Ag = 106.904 amu
109Ag = 108.905 amu
Step 2: Calculate the percentages
107.868 = 106.904 * x + 108.905 *y
x+y = 1 ⇒ x = 1 - y
107.868 = 106.904 (1 - y) + 108.905*y
107.868 = 106.904 - 106.904y + 108.905y
0.964 = 2.001y
y = 0.4818
x = 1 - 0.4818 = 0.5182
Percentage 109Ag = 48.18 %
Percentage 107Ag = 51.82 %
The heavier isotope is 109Ag. Its percentage is 48.18 ≈ 48.2 %
Protons = +1
negatrons = -1
neutrons = 0
<span>electrons = -1
</span>
<span>negatrons are like positrons and they are subatomic particles and are not present in atoms
</span>
so electrons are negatively charged and are present in atoms
hope that helps
The answer is:
C) Sound is a mechanical wave and needs a medium to travel through while light is an electromagnetic wave.
Answer:
The plum-pudding model did not identify a central nucleus as the source of a positive charge.
Explanation:
Sir Joseph John Thomson, most popularly known as J J Thomson. He was a famous scientist who was awarded the Noble prize for Physics for his discovery of the subatomic particle, electron.
He placed his famous model of an atom which is known as plum pudding model. He proposed that the atoms are described as the negative particles that is floating within a soup of the diffuse positive charge.
But the main defect of his proposal was that it did not recognized the presence of a central nucleus as a positive charged source.