Answer:
572
Explanation:
Got it right on Acellus, you take the velocity and divide it by 4 times the length.
Selenium has 36 electrons34(atomic number) + 2(amount of electrons gained in the <span>ion, has a 2- charge) = 36
</span>To identify the number of electrons an element has, all you need is a periodic table. Identify the atomic number (the smallest of the 2 numbers in the box). That number will be the number of protons which is also the number of electrons.
*number Atoms of all elements are made up of three primary particles: protons, neutrons, and electrons. The "sub-atomic" particles each have specific properties that such as size, electrical charge, etc. that are crucial for the stability of the atom. The particles break down like this: Particle Relative size Charge Location How to determine
Proton 1 + in the nucleus # of protons= element's atomic # (use periodic table)
Electron 0 - outside nucleus # of electrons=# of protons(in neutral, "normal" atom)
Neutron 1 0 in the nucleus Must be told or given (ie. can vary--isotopes--
for small elements most common form often
consists of isotope where #protons=#neutrons) Aluminum has 13 electrons because it needs 13 negative charges to balance the 13 postively-charged protons (which is what the periodic table told us it contains). This will make the Aluminum atom electrically neutral.
Answer:
Explanation:
Given
Mass of big box is M and small box is m
Tension T will cause the boxes to accelerate
where a=acceleration of the boxes
Now smaller box will slip over large box if the acceleration force will exceed the static friction
i.e. for limiting value
thus maximum tension
Mechanical advantage = (output force) / (input force)
MA = (2,000 N) / (120 N)
<em>MA = 16.67</em> (16 and 2/3)
