The elements most likely are halogens because if we talk about manner of bonding they all are diatomic molecules and need one electron to fill their outermost shell. That is why they bond with other atom of own type and exist as diatomic molecule in pure state. However, all halogens are so reactive that they react with metals through strongest type of ionic bonds and form salts.
They all tend to form salts when they react with metals like NaCl and that is why they are commonly known as salt dormers.
They perfectly show significant trends in some properties like atomic radius increases from top to bottom, boiling and melting temperature increase down the group and electronegativity value decrease from top to bottom.
The elements belong to group 17.
Hope it helps!
Please ignore my comment -- mass is not needed, here is how to solve it. pls do the math
at bottom box has only kinetic energy
ke = (1/2)mv^2
v = initial velocity
moving up until rest work done = Fs
F = kinetic fiction force = uN = umg x cos(a)
s = distance travel = h/sin(a)
h = height at top
a = slope angle
u = kinetic fiction
work = Fs = umgh x cot(a)
ke = work (use all ke to do work)
(1/2)mv^2 = umgh x cot(a)
u = (1/2)v^2 x tan (a) / gh
Answer:
a) 20 nodes b) zero nodes
Explanation:
When we have standing waves in a bend we have nodes at the ends and the equation describes the number of possible waves in the string is
L = n λ/2
Where λ is the wavelength, L is the length of the string, in our case it would be D and n is an entered. We can strip the wavelength of this expression
λ = 2L / n
Let's calculate what value of n we have for a wavelength equal to D/10
λ = 2D / n
λ = D / 10
We match and calculate
2D / n = D / 10
2 / n = 1/10
n = 20
Perform them for λ = D / 20
λ = 2D / n
2D / n = D / 20
n = 2 20 = 40
Since n is an inter there should be a wavelength for each value of n in the bone period there should be 20 different wavelengths
B) for La = 10D
2D / n = 10D
1 / n = 5
n = 1/5 = 0.2
La = 20D
2D / n = 20D
1 / n = 10
n = 1/10 = 0.1
These numbers are not entered so there can be no wave in this period
Answer:
No
Explanation:
Because if you only measure it by its mass, or weight there could be other substances with the same mass, or weight. If you wanna identify it then list the color, and streak
