.When Mendeleyev published his periodic table, there were some spaces for undiscovered elements. FIgure 15-1 is a section of a similar table. A reasonable value for the atomic mass of the missing element is__.A. 101

B.72.3

C.68.2

D.34.8

Answers

Answer 1

Answer: It's B. 72.3
(if you go to Connections Academy.)

Related Questions

Choose all the answers that apply.The scientific method _____.1. is always exactly the same in all areas of science2. can be used to organize scientific investigation3. begins with communication4. is a logical series of steps5. answers all questions
Studies show that the average height of all Earth's oceans is increasing overtime. Which of the following is a possible cause?A. Seawater is expanding as it gets warmer,B. The ocean's conveyor belt is speeding up,C. Upwellings are becoming more frequent.D. The moon's gravitational pull is decreasing.
Is ammonium permanganate ionic or covalent.
Is the direct transfer of heat between objects that touch. * Conduction radiation or convection
What are the 2 main factors that affect how quickly a coastline erodes?

What factors of nuclear reactors cause it to be so complex? Select all that apply.A) the chain reaction must be controlled at all times
B) without proper cooling the reactor will overheat
C) requires multiple different types of materials for the fuel rods
D) radiation can leak if not properly contained and cause death and destruction to nearby life

Answers

a and d because a chain reaction can be really rare at times

What happens to paper chromatography in you leave it in water for too long?

Answers

Nothing, really, the paper itself just gets wet and thats it. One thing to be careful of is, though, is that the dye/pigment can get too diluted and it would be hard to distinguish each of them from each other.

What are some natural sources for cyanide

Answers

It can be found in cigarette smoke, plastic, cassava, Lima beans, and almonds

Cyanide is found in very many places, some we would never expect. Here's a list of what I know has traces of or has cyanide in it.

Paper.
Textiles.
Plastics.
Bug Killer (Cyanide gas is used to exterminate pests and vermin in ships and buildings)
Artificial Nail Remover.
Any sort of acetonitrile-based products.
It is used to remove gold from it's ore.
It is present in the chemicals used to make photographs.
Cigarette Smoke
Vehicle Exhaust
Spinach.
Bamboo Shoots.
Almonds.
Lima Beans.
Miscellaneous Fruit Pits.
Tapioca.

These are just what I know of, I'm sure there's many more.

Hope this helped! :)

Water initially present in a state where molecules are far apart. During a chnge of state, its molecules slow down. Which change of state has most likely taken place?A. From gas to a liquid
B. From a liquid to gas
C. From solid to liquid
D. From a gas to plasma

Answers

Answer:

is the letter A. from gas to a liquid

Consider the differences between organic and inorganiccompounds as you answer each of the following questions.
a. Which compounds make good electrolytes?
b. Which compounds exhibit ionic bonding?
c. Which compounds have lower melting points?
d. Which compounds are more likely to be soluble
in water?
e. Which compounds are flammable?

Answers

Answer: organic compounds has made up of organic materials inorganic compounds are made up of inorganic materials.

organic compounds make good electrolytes

inorganic compounds exhibit ionic bonding

organic compounds lower melting points

Explanation:

What happens when you touch cold ice with your warm hand? a. heat only transfers from the ice to your hand b. heat only transfers from your hand to the ice c. heat transfers from the ice to your hand and from your hand to the ice d. heat does not transfer between the ice and your hand