<span>Electronegativity means the ability to attract electrons. Since He is a noble gas, it does not attract any more electrons. Cesium and Calcium are both metals, which lose electrons.
Fluorine is the right answer. It is highly electronegative which is the reason that fluorine is considered the most reactive non-metal.</span>
The gas pop and makes heat
The answer should be different. Acids must be in water to ionize.
We can use the magnification equation for this problem.
Magnification equation:
<em>hi/h0 = di/d0</em>
Where in <em>hi </em>: image size, <em>h0</em> : object size, <em>di </em>: image distance, <em>d0 </em>: object distance from mirror
So plugging in the given variables we will have the corresponding equation
0.1 m / 0.3 m = <em>di / </em>0.4 m
<em>di</em> = 0.1333333m
The generated image of the object is located 0.13 meters or 13 cm away from the mirror
