Sodium (Na) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence elec
2 answers:
<u>Answer:</u> The correct answer is 1.
<u>Explanation:</u>
Valence electrons are defined as the electrons that are present in the outermost shell of an atom.
Sodium is the 11th element in the periodic table. the number of electrons in this element are 11.
The electronic configuration of this element is
Valence shell of this element is 3s and number of electrons present in this shell is 1.
Hence, the correct answer is 1.
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Answer:
The actual angle is 30°
Explanation:
<h2>Equation of projectile:</h2><h2>y axis:</h2>the velocity is Zero when the projectile reach in the maximum altitude:
When the time is vo/g the projectile are in the middle of the range.
<h2>x axis:</h2>R=Range
**sin(2A)=2sin(A)cos(A)
<h2>The maximum range occurs when A=45°(because sin(90°)=1)</h2><h2>The actual range R'=(2/√3)R:</h2>Let B the actual angle of projectile
2B=60°
B=30°
True
In fact, the weight of an object on the surface of the Earth is given by:
where m is the mass of the object and
is the gravitational acceleration on Earth's surface. If we use the mass of the object, m=3.0 kg, we find
In fact, the weight of an object on the surface of the Earth is given by:
where m is the mass of the object and