The half-life of fluorine-20 is 11.4 seconds. After _______ seconds, 1/4 of the original amount of fluorine-20 will remain

Answer is Ca which is a metal.

Explanation: Milk is composed of many elements such as Calcium (Ca), Magnesium(Mg), Phosphorus(P), Potassium (K), Zinc(Zn) ans Selenium(Se). The major component present is Ca.

Calcium present helps in the formation of bones and teeth and maintaining it to keep healthy.

Elements which can loose electrons easily to obtain a stable configuration is called as a metal.

Calcium is a metal as it can easily loose 2 electrons to obtain a stable configuration.

Final answer:

Calcium, a metal, is the element in milk that makes it beneficial for health. It contributes to healthy bones, teeth, and the proper functioning of various body organs. Metalloids or semimetals like boron or silicon are not responsible for the health benefits of milk.

Explanation:

The element that makes milk good for health is Calcium. Calcium is a metal that is needed by the body for healthy bones, teeth, and proper function of the heart, muscles, and nerves. It is a representative metal that shows good conduction of heat and electricity. Milk is a primary source of Calcium, which is why it is considered beneficial for health.

On the other hand, elements such as boron, silicon, germanium, arsenic, antimony, and tellurium are considered metalloids or sometimes semimetals, which exhibit properties between metals and nonmetals. However, these are not the elements responsible for the health benefits of milk.

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OP already did it - CONGRATS!!

here are the steps 2 get the same ans:

(NH4)2 CO3 has 2x N, 8x H, 1x C and 3x O per molecule

so its molecular mass = 2x14 + 8x1 + 1x12 + 3x16

=28+8+12+48

=96g

of that 96g, 8x1=8g is due to Hydrogen

so by ratio n proportion, 1.00g will have 1x8/96 = 1/12g = 0.083g of H

The products obtained when 2 AgNO₃ + Na₂CrO₄ reacts is  Ag₂CrO₄ + 2 NaNO₃.

What is a Redox Reaction ?

The reaction in which reduction and oxidation takes place simultaneously

by obtaining or losing an electron, the oxidation number of a molecule, atom, or ion varies.

In the question it is given that

AgNO₃(aq) + Na₂CrO₄(aq) → and we have to predict the products

So Silver Nitrate when reacts with Chromic Acid to from silver Chromate and sodium nitrate.

2 AgNO₃ + Na₂CrO₄ → Ag₂CrO₄ + 2 NaNO₃

Therefore Product B is the correct answer.

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Answer: D. A buildup of mostly methane gas, which is pontentially explosive.

Explanation:

Firedamp refers to a gas mixture, largely methane, that appear in underground coal mines.  It is explosive at concentrations between 5 and 10% in the air.

The atomic number of an element is the number of its protons. Here, the total number of electrons is 79 and thus the element s having 79 protons also. Thus, option 2 is correct.

What is protons?

An atom is composed of nucleus and and electrons. Protons and neutrons are located inside the nucleus. Electrons are revolving around the nucleus.Electrons are negatively charged particles and protons are positively charged whereas neutrons are neutral.

The atomic number of an element is the number of its electrons or protons. For a neutral atom the number of electrons and protons are equal. Thus all the positive charges are neutralized by equal number of negative charges.

The electrons are filled in different orbitals and from the configuration we can understand the number of electrons given is 79. Thus its number of electrons and protons is 79.

Hence, the number of protons for the element with the given electronic configuration is 79. The name of this element is gold.

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