Answer: All apply
The periodic table is an arrangement of the chemical elements in the form of a table, ordered by:
-Their atomic number (number of protons)
-Their configuration of electrons
-Their chemical properties
It was progressively developed over time as the scientific knowledge advanced; for this reason many modifications and corrections might be done in the future.
Its usefulness lies in the fact that it allows the existing elements to be organized in a more structured and coherent way, according to the chemical properties they possess. Dividing the table into rows and columns, which represent the periods and groups or families.
Then, with the location and classification of an element according to its group, we can determine how it acts by knowing its chemical and physical characteristics.
This is how with this configuration can be distinguished 4 sets of chemical elements, according to the ease of their atoms to lose or gain electrons, transforming into ions: metals, semimetals, non-metals and noble gases.
This has helped to predict the existence of various elements that have not yet been discovered, because by elements already located in the table and the periodicity found, <u>there are still empty spaces that indicate the composition of the element that has not yet been found</u>.
In addition, this table helps to simplify in some way the teaching of chemical elements and facilitates their learning, as well as their usage in the development of technological innovations.
It’s light seconds, now don’t mistake it as time
<h2>The option ( b ) is appropriate answer </h2>
Explanation:
When a projectile is projected from height horizontally . The only force acting upon it is the downwards gravitational force of attraction due to earth .
Due to this force its vertical component of velocity , which is in the downward direction will be increased .
As there is no force horizontally , the horizontal velocity of throw will remain constant .
Thus ( b ) option is the correct option .
Answer:
maximum possible speed by solving above equation for 7D is
minimum possible value of speed for solving x = 6D is given as
Explanation:
Let the nozzle of the hose be at the origin. Then the nearest part of the rim of the tank is at (, ) = (6, 2) and the furthest part of the rim is at (, ) = (7, 2).
The trajectory of the water can be found as follows:
Now from above two equations we have
now we know that height of the cylinder is 2D so we have
by solving above equation we have
now we know that maximum value of x is 7D
so the maximum possible speed by solving above equation for 7D is
minimum possible value of speed for solving x = 6D is given as
Answer:
An object appears white when it reflects all wavelengths and black when it absorbs them all. Red, green and blue are the additive primary colors of the color spectrum. Combining balanced amounts of red, green and blue lights also produces pure white.
Explanation:
