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suter [353]
3 years ago
5

Elements in the same ____ have the same numbers of valence electrons?

Engineering
2 answers:
lions [1.4K]3 years ago
8 0
Explanation: For main group elements, the number of valence electrons is the same in every element in the same group. Group 1 elements have 1 valence electron in the s orbital.
Elena L [17]3 years ago
8 0

Answer:

Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next. Within each column, or group, of the table, all the elements have the same number of valence electrons.

Explanation:

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All machines have three fundamental hazards: moving parts, point of operation, and?
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All machines have three fundamental hazards: moving parts, point of operation, and the power transmission.

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The unit that supplies power to the machine is a critical hazard due to high energy sources being potential fatal if proper protocols are not followed. This is why lockout tagout (LOTO) measures are put in place in order to protect people while they work on equipment.

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A dead-man system should shut off fuel flow within ____ of the system’s maximum flow rate.
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4 years ago
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Steam at a pressure of 0.08 bar and a quality of 93.2% enters a shell-and-tube heat exchanger where it condenses on the outside
Semenov [28]

Answer:

The answer is "\bold{9.09\times 10^6 \frac{kg}{hour}}".

Explanation:

For the reference table we get:

h1 = 2410 \frac{kJ}{kg} \ , at \ \ \\\\ \ P = 0.08 \ bar \ and \ \ quality = 0.932

Through steam tables, they get:

\ h2 = 173.9 \frac{kJ}{kg} \ on\\\\ \ P = 0.08 \ bars \ \ \ but \ quality = 0 (sat.liquid),

Water power transfer = \ 3.4 \times  10 ^ 5 \times  (2410-173.9)\\

It should be comparable to the water enthalpy:

m_{water}\times Cp\times (T2-T1)\\\\For \ eg:\\\\ = 3.4 \times 10 ^ 5\times (2410-173.9) \\\\ = m_{water}\times4.18\times(35-15)\\  

m_{water}=9.09\times 10^6 \frac{kg}{hour}

4 0
4 years ago
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