Answer:
Although you might think of a machine as complex system of gears, drive belts and and a motor, the definition physicists use is much simpler. A machine is simply a device that does work, and there are only six different types of simple machines. They include the lever, the pulley, the wheel and axle, the screw, the wedge and the inclined plane.
Explanation:
H and O
CI and F
Mg and N
P and O
Cs and F
*should know them from the first letter very easy*
Answer:
alkali metal
Explanation:
The alkali metals in period 4 will have the lowest ionization energy of the elements in the period.
Across a period ionization energy increases progressively from left to right due to decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.
- Ionization energy is the energy needed to remove the most loosely bound electrons of an atom in the gas phase in the ground state.
- The measure of the readiness of an atom to lose an electron is the ionization energy.
Down a group, it decreases.
<u>Answer:</u> The percentage abundance of oxygen-16 isotope is 99.76 %
<u>Explanation:</u>
We are given:
Three isotopes of oxygen are there, O-16, O-17 and O-18
Mass of Oxygen-16 isotope = 15.995 amu
Mass of Oxygen-17 isotope = 16.999 amu
Mass of Oxygen-18 isotope = 17.999 amu
Percentage abundance of Oxygen-17 isotope = 0.04 %
Percentage abundance of Oxygen-18 isotope = 0.2 %
We know that:
Percentage abundance of all isotopes together is 100 %
So, Percentage abundance of Oxygen-16 isotope = [100 - (0.04 + 0.2)] = 99.76 %
Hence, the percentage abundance of oxygen-16 isotope is 99.76 %
The kinetic model theory states that the particles of gases behave as perfectly elastic spheres, exhibiting elastic collisions, where kinetic energy is conserved, whenever they hit something.
