Explanation:
It is known that the atomic number of sodium is 11 and its electronic distribution is 2, 8, 1.
As the number of rows (called periods) in the periodic table represent the number of shells present in an element.
Since, sodium element have only two shells. Therefore, sodium lies in row 2 of the periodic table.
Also, the elements which contain same number of valence electrons lie in the same group.
Therefore, sodium belongs to group 1 and elements of the group 1 are also known as alkali metals.
Thus, we can conclude that in the periodic table sodium lies in period 2 and group 1.
When a gas is confined in a container, it exerts pressure due to the collision of its particles with the walls of the container. This is explained by the kinetic theory of gases, which states that gas particles are in constant random motion. Temperature also plays a role in gas pressure.
When a gas is confined in a container, it exerts pressure due to the collision of its particles with the walls of the container. This is explained by the kinetic theory of gases, which states that gas particles are in constant random motion. The more collisions occur per unit time, the higher the pressure of the gas.
For example, if you squeeze a balloon, the gas inside it gets compressed, and the particles collide with the surface of the balloon more frequently, resulting in an increase in pressure.
Another factor that influences gas pressure is the temperature. According to Charles's Law, when the temperature of a gas increases, its particles move faster, leading to more frequent and energetic collisions with the container walls, thereby increasing the pressure.
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(2) equal to the total number of protons gained
(3) less than the total number of electrons gained
(4) less than the total number of protons gained
Answer is: (1) equal to the total number of electrons gained.
In oxido-reduction reaction, at least one element lose and one element gain electrons.
Oxidation reaction is increasing of oxidation number of atom, because element lost electrons in chemical reaction.
Reduction is lowering oxidation number because atom gain electrons.
For example, in oxidation-reduction reaction: 2H₂ + O₂ → 2H₂O; hydrogen is oxidized (change oxidation number from 0 to +1) and oxygen i s reduced (change oxidation number from 0 to -2).
Hydrogen lost .four electrons anf oxygen gain four electrons
To calculate the volume of 20.0 g of benzene, use the formula volume = mass/density. Given that the density of benzene is 0.879 g/mL, the volume is approximately 22.75 mL when you divide 20.0 g by 0.879 g/mL.
To find the volume of 20.0 g of benzene, we need to use the density of benzene because density is defined as mass per unit volume (density = mass/volume). The formula to calculate the volume from the mass and density is volume = mass/density.
In this case, we are given:
To calculate the volume, we divide the mass by the density:
Volume = Mass / Density = 20.0 g / 0.879 g/mL
We can now perform the calculation:
Volume = 20.0 g / 0.879 g/mL ≈ 22.75 mL
Therefore, the volume of 20.0 g of benzene is approximately 22.75 mL.
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(2) 2 electrons in the first shell
(3) 3 electron shells
(4) 22 neutrons