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Alik [6]
3 years ago
12

Mendeleev noticed that if he organized the elements by atomic weight certain patterns emerged. For instance, elements in the sam

e group (family) appeared to have the same
A) valence.
B) melting point.
C) isotopic ratio.
D) number of neutrons.
Physics
2 answers:
Inga [223]3 years ago
6 0
I've had a similar question on an assignment myself, so I'm going to assume it had the same idea.

When you organize them in such a way, the pattern that emerges tells you elements organized by atomic weight have the same number of valence electrons.

Hope this helps!
lys-0071 [83]3 years ago
5 0

Answer:

Is option A

Explanation:

The correct answer is valence. Our current periodic table puts these elements in the same column on the periodic table. We now know they have the same number of valence electrons.

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The half-life of a certain isotope is 12 years. How much of a 600 g sample will remain after 36 years?
miskamm [114]

36/12= 3   3 IS THE AMOUT OF HALFLIVES

ONE HALF LIFE = 300

TWO HALF LIFE = 150

THREE HALF LIFE = 75


*Divide 600 three times

8 0
3 years ago
Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 1
zavuch27 [327]

Answer:

The measurement which is the most precise is 104.6 °C.

Explanation:

The measurement which is most precise must be very close to the actual value of the temperature.

Thus, the unit which have less value of the |Δx| (error) must be most precise.

Thus,

Actual value = 105.1 °C

Value = 103.7 °C

<u>|Δx| = 1.4 °C</u>

Value = 108.4 °C

<u>|Δx| = 3.3 °C</u>

Value = 105.8 °C

<u>|Δx| = 0.7 °C</u>

Value = 104.6 °C

<u>|Δx| = 0.5 °C</u>

<u>Thus, The measurement which is the most precise is 104.6 °C.</u>

3 0
2 years ago
Gravitational pull between 2 objects is determined by which of the following?
vampirchik [111]
Both distance between and mass of the 2 objects.
3 0
3 years ago
Read 2 more answers
A worker on the roof of a house drops his 0.58 kg hammer, which slides down the roof at constant speed of 6.69 m/s. The roof mak
shusha [124]

Answer:

17.3 m

Explanation:

Given that,

Mass of a hammer is 0.58 kg

Velocity with which the hammer slides is 6.69 m/s at constant speed.

The roof makes an angle of 18 ◦ with the horizontal, and its lowest point is 18.2 m from the ground. We need to find the horizontal distance traveled by the hammer between the time is leaves the roof of the house and the time it hits the ground. Firstly, we will find the time taken by the hammer when it reaches ground in vertical direction.

y=y_0+v_ot +\dfrac{1}{2}gt^2

Putting all the values,

0=18.2+6.69t-\dfrac{1}{2}\times 9.8t^2\\\\-4.9t^2+6.69t+18.2=0\\\\t=\dfrac{-6.69+\sqrt{6.69^{2}-4\cdot-4.9\cdot18.2}}{2\cdot-4.9}, \dfrac{-6.69-\sqrt{6.69^{2}-4\cdot-4.9\cdot18.2}}{2\cdot-4.9}\\\\t=-1.36\ s\ \text{and}\ t=2.72\ s

Neglecting negative value,

To find horizontal distance, multiply 2.72 s with the horizontal component of velocity.

d=2.72\times 6.69\times \cos(18)\\\\d=17.3\ m

3 0
3 years ago
Technician A says that the pushrods should be rotating while the engine is running if the camshaft and lifters are okay. Technic
Karo-lina-s [1.5K]

Answer:

Technician A

Explanation:

camshafts rotate at one-half the crankshaft speed

6 0
3 years ago
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