Answer : The atomic radius for Ti is, 
Explanation :
Atomic weight = 47.87 g/mole
Avogadro's number 
First we have to calculate the volume of HCP crystal structure.
Formula used :
.............(1)
where,
= density = 
Z = number of atom in unit cell (for HCP = 6)
M = atomic mass = 47.87 g/mole
= Avogadro's number
V = volume of HCP crystal structure = ?
Now put all the values in above formula (1), we get
Now we have to calculate the atomic radius for Ti.
Formula used :
Given:
c/a ratio = 1.669 that means, c = 1.669 a
Now put (c = 1.669 a) and (a = 2R) in this formula, we get:
Now put all the given values in this formula, we get:
Therefore, the atomic radius for Ti is,
Explanation:
Gamma rays are the electromagnetic waves that have the highest frequency and the lowest wavelength compared to all other electromagnetic waves.
f = 300 EHz
In terms of frequency the order of frequency is
Gamma rays > X rays > Ultraviolet > Visible > Infrared > high frequency > low frequency > Extremely low frequency
In terms of wavelength the order is the opposite of the frequency
Gamma rays < X rays < Ultraviolet < Visible < Infrared < high frequency < low frequency < Extremely low frequency
Answer:
Only to elements are gases at room temperature and standard pressure.
Fluorine and chlorine.
Explanation:
The group 17 is called halogen.
There are five elements in halogen group.
All halogens required one electrons to complete the octet and to get the noble gas electronic configuration.
All halogen elements have seven valance electrons.
Halogen elements:
Fluorine, chlorine, Bromine, iodine and astatine
Fluorine is gas at room temperature which s 25°C and standard pressure which is 1 atm.
It is present in the from of F₂.
Chlorine is also gas at room temperature and standard pressure.
It is present in the from of Cl₂.
The bromine is liquid under these condition.
Iodine and astatine are solids.
As we move down the group their melting and boiling points increases.
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