Methane (CH4), a common greenhouse gas, has five atoms, one of carbon (C) and four of In Period 1 there are two elements, hydrogen (H) and helium (He).

Classify the following into elements and compounds., mercuric oxide, helium gas, water, table salt, iodine, mercury, oxygen, nitrogen. - 12120901

Explanation: An element is a pure substance as well, because if we fill up a balloon with just helium gas, it will only contain helium atoms. On the periodic table of elements, helium is element number 2, and so that should tell you that it's an element of course. Helium is a chemical element and a colorless, odorless, tasteless, inert gas. It has the smallest atomic radius of any element and the second-lowest atomic weight.

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Helium is the second most prevalent element in the universe, after hydrogen.However, the atmosphere contains only 5 ppm volume of helium. Helium concentrations in seawater are no higher than 4-7 ppt. Concentrations are relatively low, because helium as a noble gas only occurs as separate atoms, and usually does not react with any other particles. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. The chemical symbol for Helium is He . It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. compound is water.

Helium is the second most prevalent element in the universe, after hydrogen.However, the atmosphere contains only 5 ppm volume of helium. Helium concentrations in seawater are no higher than 4-7 ppt. Concentrations are relatively low, because helium as a noble gas only occurs as separate atoms, and usually does not react with any other particles.

Explanation: Since hydrogen is an element. Hydrogen gas (H2) is a molecule, but not a compound because it is made of  Aug 14, 2019 Find an answer to your question classify the following as element and compound. 1) mercuric oxide 2) helium gas 3) water 4) table salt 5)  Helium is one of only two natural elements that has never been observed bonding to another element in a compound. The other element is neon.

approach has been a single element monochromator based on Reflection Zone Plates [2]. The current design as Compound Semiconductor Crystals from Ordered Me- tastable Nanorods. Multi-wire proportional counter gas detector, 20 · 20 cm2. 2. tive liquid helium cooled Si- or InSb – bolometers or fast Schottky 

Learn vocabulary, terms, and more with flashcards, games, and other study tools. A pure substance (an element or compound) has a fixed composition while a mixture does not. a) Air is a combination of nitrogen gas and oxygen gas with various amounts of other materials such as water vapor, carbon dioxide and particulates. Air quality (based on its composition) varies on a daily basis. Thus it is a mixture.

Nevertheless ducing a trivalent doping element such as Cr, Gd, La, Al, etc. in UO2 leads to formation of filled helium gas inside the fuel rod, decreasing the gap conductance and thereby.
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Helium is a chemical element (not compound, not mixture), symbol He; the helium molecule has two atoms. Is helium an element, mixture or a compound? - Quora.

is it homogeneous, heterogeneous, element, or compound? pure substance (element) is ammonia (NH3) a mixture or a pure substance?
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Classify each of the following pure substances as an element or a compound: a. helium gas (He) is element b. sulfur (S) is element c. sugar (C 12 H 22 O 11) is a compound d. mercury (Hg) in a thermometer is element e. lye (NaOH) is a compound 2. A dietitian includes one of the following mixtures in the lunch menu. Classify each as homogeneous

Aluminum foil 2. Gold 3. Helium gas Element or compound? Why? Paki sagot po kung element or compound tas paki explain po thanks 2017-02-09 Classify each of the following pure substances as an element or a compound: a. helium gas (He) b. mercury (Hg) in a thermometer c.