The statement “a particular element consists of several isotopes” should be explained. Concept Introduction: The atoms of same element with different mass number or atomic mass are called isotopes. They have same number of protons and electrons but different number of neutrons. Therefore, it is not necessary the all atoms of a given element contain the same number of neutrons in their nuclei. For example, hydrogen has three isotopes H 1 , H 2 , H 3 with 0, 1 and 2 neutrons in their nuclei respectively. The atomic symbol notation is as follows: Atomic number, Z Mass number, A Atomic Symbol Charge , + / − Here A = mass number which is equal to the total number of protons + number of neutrons, Z = atomic number of any element which is also indicates Number of protons or number of electrons in the given atom. The charge of an ion is showed by + or − sign on the right side super script.
The statement “a particular element consists of several isotopes” should be explained. Concept Introduction: The atoms of same element with different mass number or atomic mass are called isotopes. They have same number of protons and electrons but different number of neutrons. Therefore, it is not necessary the all atoms of a given element contain the same number of neutrons in their nuclei. For example, hydrogen has three isotopes H 1 , H 2 , H 3 with 0, 1 and 2 neutrons in their nuclei respectively. The atomic symbol notation is as follows: Atomic number, Z Mass number, A Atomic Symbol Charge , + / − Here A = mass number which is equal to the total number of protons + number of neutrons, Z = atomic number of any element which is also indicates Number of protons or number of electrons in the given atom. The charge of an ion is showed by + or − sign on the right side super script.
Solution Summary: The author explains the statement "a particular element consists of several isotopes" and the atomic symbol notation.
The statement “a particular element consists of several isotopes” should be explained.
Concept Introduction:
The atoms of same element with different mass number or atomic mass are called isotopes. They have same number of protons and electrons but different number of neutrons. Therefore, it is not necessary the all atoms of a given element contain the same number of neutrons in their nuclei. For example, hydrogen has three isotopesH1, H2, H3 with 0, 1 and 2 neutrons in their nuclei respectively.
Here A = mass number which is equal to the total number of protons + number of neutrons, Z = atomic number of any element which is also indicates Number of protons or number of electrons in the given atom.
The charge of an ion is showed by + or − sign on the right side super script.
For Raman spectroscopy/imaging, which statement is not true regarding its disadvantages?
a) Limited spatial resolution.
b) Short integration time.
c) A one-dimensional technique.
d) Weak signal, only 1 in 108 incident photons is Raman scattered.
e) Fluorescence interference.
Using a cell of known pathlength b = 1.25115 x 10-3 cm, a water absorption spectrum was measured. The band at 1645 cm-1, assigned to the O-H bending, showed an absorbance, A, of 1.40.
a) Assuming that water density is 1.00 g/mL, calculate the water molar concentration c (hint: M= mole/L)
b) Calculate the molar absorptivity, a, of the 1645 cm-1 band
c) The transmitted light, I, can be written as I= Ioexp(-xb), where x is the absorption coefficient (sometimes designated as alpha), Io is the input light, and b is the cell pathlength. Prove that x= (ln10)*x*c
d) Calculate x for the 1645 cm-1 band
Convert 1.38 eV into wavelength (nm) and wavenumber (cm-1) (c = 2.998 x 108 m/s; h = 6.626 x 10-34 J*s).