Answer:
when they have satisfied the octet rule naturally or through bonding to obtain full valence shells
Explanation:
Generally, most atoms of an element are unstable because they have a void in their electron shell to fill, hence, they need to react with other elements to fulfil this task of octet.
Octet rule states that atoms of elements engage in reactions to form compounds so they can have eight (8) valence electrons in their shell. Noble gases e.g argon, neon etc. are elements that have naturally satisfied this octet rule by possession of 8 valence electrons in their shell. Other elements that do not have this naturally becomes reactive and enter bonding with other atoms to obtain full valence shells.
Answer:
3min=180s so 180:30=6
=6
1 30 seconds
2 32 seconds
3 10 seconds
4 29 seconds
Sugar does not dissolve in water.
The time recorded for Trial 3 may be inaccurate.
His experiment has very low precision.
Answer:
His experiment has very low precision
Explanation:
Precision is how close the answers are together. The answers are increasing in time. So, this makes sence. None of the answers are similar to one another.
(2) electrons and protons
(3) neutrons and protons
(4) neutrons, protons, and electrons
The nucleus of an atom contains the majority of its mass and is composed of two types of subatomic particles: protons and neutrons.
1. Protons: Protons are positively charged particles found in the nucleus of an atom. Each proton carries a charge of +1 and has a relatively high mass compared to electrons. The number of protons in an atom's nucleus determines its atomic number, which in turn defines the element. In the case of helium-4 (He-4), it has an atomic number of 2, indicating that there are two protons in its nucleus.
2. Neutrons: Neutrons are electrically neutral particles, meaning they have no net charge. They are also located in the nucleus of an atom. Neutrons contribute to the mass of the nucleus and help stabilize it by balancing the electrostatic repulsion between positively charged protons. Helium-4, being a stable isotope of helium, has two neutrons in its nucleus, along with the two protons.
Electrons, on the other hand, are found in electron shells or orbitals outside the nucleus, not within it. Their role is to move around the nucleus and create the electron cloud or electron configuration, which determines an atom's chemical properties.
In summary, the nucleus of a helium-4 atom consists of neutrons and protons, making option (3) "neutrons and protons" the correct choice. Electrons, which are negatively charged, are located outside the nucleus and are involved in chemical interactions and bonding.
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Which compound could be represented by X?
(1) CH (3) C3H8
(2) C2H4 (4) C4H10
The organic compound X in the given reaction is ethylene, C₂H₄. The two chlorine atoms are joined to the double bond of ethylene and form C₂H₄Cl₂. Hence, option 2 is correct.
Halogenation is the electrophilic addition of any halogen atom such as Cl. F etc. to an organic compound mostly in the presence of acids. Halogens are more reactive towards alkenes and alkynes.
The unsaturated centers in the organic compound are electron deficient and they attract negative halogen ions forming respective halides. Ethylene is the primary alkene with the skeleton CH₂ =CH₂.
The incoming Cl groups attack the double bond and joins the carbon atom to form CH₂Cl - CH₂Cl or C₂H₄Cl₂. Hence, the compound X in the given reaction is C₂H₄Cl₂. Thus, option 2 is correct.
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