Answer:
16 °C
Explanation:
Step 1: Given data
- Provided heat (Q): 811.68 J
- Mass of the metal (m): 95 g
- Specific heat capacity of the metal (c): 0.534 J/g.°C
Step 2: Calculate the temperature change (ΔT) experienced by the metal
We will use the following expression.
Q = c × m × ΔT
ΔT = Q/c × m
ΔT = 811.68 J/(0.534 J/g.°C) × 95 g = 16 °C
IT forms because they are highly reactive elements.
Ans: As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit will <u>increase.</u>
The energy (E) is related to the frequency (ν) by the following equation:
E = hν
where h = planck's constant
The change in energy i between levels is:
ΔΕ = h(Δν) -----(1)
Based on the above equation, as the changes in energy levels increase, the frequency of emitted radiation will also increase.
Explanation:
Electronic configuration of uranium is given below -
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s²6p⁶5f³6d¹7s2²
Effective nuclear charge (Z eff) = Atomic number (Z) - Shielding constant (S)
<u>
Value of Shielding constant (S) can be calculated by using slater's rule :
</u>
S = 1 (0.35) + 9 (0.85) + 81 (1.00)
S = 0.35 + 7.65 + 81.00
S = 89
So,
Zeff = Z - S
Zeff = 92 - 89
<u>
Zeff = 3
</u>
Hence, Effective nuclear charge (Zeff) of uranium = <u>3
</u>
5s electron is closest to the nucleus.
