All categories

2 years ago

Which statement correctly compares the valence electrons for atoms of francium (Fr) and barium (Ba)?

Physics

2 answers:

Sauron [17]2 years ago

8 0

Answer:

Francium has fewer valence electrons, but they are in a higher energy level

34kurt2 years ago

5 0

From the Periodic Table...

Francium is a group 1 Element and Barium is a Group 2 Element

This statement is a giveaway as it already tells you that Barium has more valence electrons than Francium since it has 2 electrons in its Outer shell.

This Eliminates Options A and B

Francium has more electrons than Barium

So It should be at a higher energy level.

You might be interested in

Hi guys this is my last points and i need some answers :)

Zinaida [17]

Answer:

Number 1: B Number 2: D

Explanation:

6 0

3 years ago

A vertical steel beam in a building supports a load of 6.0×10⁴. If the length of the beam is 4.0m and it's cross-sectional area

Furkat [3]

Answer:

DL = 1.5*10^-4[m]

Explanation:

First we will determine the initial values of the problem, in this way we have:

F = 60000[N]

L = 4 [m]

A = 0.008 [m^2]

DL = distance of the beam compressed along its length [m]

With the following equation we can find DL

$\frac{F}{A} = Y*\frac{DL}{L} \\where:\\Y = young's modulus = 2*10^{11} [Pa]\\DL=\frac{F*L}{Y*A} \\DL=\frac{60000*4}{2*10^{11} *0.008} \\DL= 1.5*10^{-4} [m]$

Note: The question should be related with the distance, not with the diameter, since the diameter can be found very easily using the equation for a circular area.

$A=\frac{\pi}{4} *D^{2} \\D = \sqrt{\frac{A*4}{\pi} } \\D = \sqrt{\frac{0.008*4}{\\pi } \\\\D = 0.1[m]$

3 0

3 years ago

A scientist is using an objective lens with 40X magnification on his microscope. If the ocular lens magnifies 10X, what is the t

zubka84 [21]

Answer:

400x

Total magnification = 40 × 10= 400x

8 0

2 years ago

What is the change in velocity if the final velocity is 80 mph and the initial velocity is 20 mph? Is the object speeding up or

Dimas [21]

Answer: Δv=vf-vi=80mph-20mph=60mph

7 0

2 years ago

Foraging bees often move in straight lines away from and toward their hives. Suppose a bee starts at its hive and flies 680 m du

lys-0071 [83]

Represent the motion in the number line.

Movement to the east is movement to the negative side. Movement to the west is movement to the positive side.

Total displacement = -680m + 430m - 620m = -870m

Total displacement = 860m to the east.

8 0

3 years ago