This table provides information about some group 1 elements. Melting Point (°C)
181
98
63
Element
3
LI
Lithium
6.941
11
Na
Sodium
22.99
19
R
Potassium
39.10
37
Rb
Rubidium
85.47
55
Cs
Cesium
132.91
87
Fr
Francium
2
29
27
(223)
Which is the best estimate of the melting point of Rubidium (Rb)?
25°C
40°C
ОООО
75°C
184°C

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Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )