Which of the following describes the element Ba? Choose all that apply:(a) is very reactive as a metal; (b) consists of diatomic molecules in elemental form; (c) forms an ion with a charge of 2; (d) forms a cation that is isoelectronic with a noble gas; (e) reacts with alkali metals to form salts; (f) is one of the group of the least reactive elements.

Q: Can you determine which of two unknown elements has the larger radius ifthe only known information…

A: From left to right across a period in the periodic table, the atomic radius generally decreases.…

Q: 7.21 Specify the group of the periodic table in which each of the following elements is found: (a)…

A: Electrons are filled in this order The outer electron configuration of the elements in group 1A is…

Q: 49. Write the full electron configuration (1s22s², etc.) for each of the following elements. a.…

A: The electron configuration of any element describes that how the distribution of Electron in its…

Q: 7.26 Define atomic radius. Does the size of an atom have aprecise meaning? Explain.

A: To find: Definition of atomic radius.  Does the size of an atom have a precise meaning? Explain

Q: Write the full electron configuration (1s22s2, etc.) for the following element. Bromine, Z = 35

A: Given : The element is Bromine i.e Br with atomic number 35.

Q: The actual ionization energy of He is 2372.3 kJ/mol. Which of the following can be said about the…

A: We need to describe the shielding effect in helium.

Q: Why the elements of group 13 are called p-block elements?

A: P-block elements are those which which last electron enters in any of three p-orbital subshells.

Q: Identify the correct ranking of effective nuclear charge between N,O, and C? Why is that?

A: The effective nuclear charge is the net positive charge experienced by an electron in a…

Q: How would you rank the following elements in the order of increasing size: S, Si, O, Mg, and F?

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Q: The ionization energy for a H atom 1s electron is 2.18x10-18 J and that for a 2p electron is…

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Q: Place the following elements in order of decreasing atomic size: bismuth, bromine, neon, cesium,…

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Q: Some patterns of electron configuration are Iisted below. In each case, [G] stands for a HOE gas…

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Q: Arrange the following sets of elements in order of increasing atomic size. a. Sn, Xe, Rb, Sr b. Rn,…

A: On moving down to group atomic size increases due to addition of shell while on moving left to right…

Q: (-218 a) E, = where Z is atomic number, n is the energy level. and al is the abbreviation for the…

A:

Q: A. A main group element with the valence electron configuration 2s 2p is in periodic group It forms…

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Q: List the following atoms in order of increasing radius (lowest to highest): Li, Te, Br, Mg

A:

Q: The electronic configuration of a certain element known as element E, is      1s22s22p4.   Write a…

A: Electronic configuration of element E : 1s22s22p4

Q: (1) What is the element with an electron configuration of 1s²2s 2p°3s²3p°4s²3d$? (2) What is the…

A: Write the element by using their electronic configuration ?

Q: The electronic configuration of a certain element known as element E, is      1s22s22p4.   Write a…

A: Electronic configuration of a certain element known as element E : 1s22s22p4.

Q: An electron moving at 2.90X10T m/s is found 7.04x10- n what is the mass of the to have á wavieleng…

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Q: 8.48 (a) Why do successive IEs of a given element always in- crease? (b) When the difference between…

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Q: Which of the following statements concerning the Pauli exclusion principle is/are CORRECT?   1.…

A: According to Pauli Exclusion Principle,

Q: How many sublevels are there with n = 3 in an atom?

A:

Q: Put the following atoms and ions in order of increasing ionic radius: F, S, Cl, and Se

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Q: Answer the following questions about the elements with the configurations shown here: A= [Ar]4s2…

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Q: Which one of the following sets of quantum numbers could be those of the distinguishing last…

A: Given Element ' Mo (Atomic No 42) 1s22s22p63s23p63d104s24p64d55s1 A transition Metal  Last electron…

Q: With specific reference to the Calcium atom, describe what is meant by the term 'shielding effect'.

A: Shielding effect: Shielding effect is defined as the decrease in attraction between an electron and…

Q: (1) What is the element with an electron configuration of 1s²2s²2p°3s'3p°4s°3«®? (2) What is the…

A:

Q: 1.34 In Fig. 1.16, identify the trends in the first ionization energies of the elements in (a)…

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Q: The ionization energies of the first 4 electrons of an element are: 570, 1825, 2800 and 11700kJ/mol…

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Q: Which is higher in energy, the 2s or 2p orbitl, in hydrogen? Is this also true for helium? Explain.

A:

Q: Which of these spheres represents F, which represents Br,and which represents Br-?

A: We are given the elements F and Br they belong to the group-17 and they are known as the halogens.…

Q: State the Aufbau principle, and explain the role it plays in classifying the elements in the…

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Q: Which of the following equations represents the 1st lonization Energy of sodium. Select one: O a.…

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Q: (Q71) Which of the following accounts for elements in groups exhibiting similar chemical behavior?…

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Q: The energy required to ionize rubidium is 403 kJ/mol. What wavelength of light, in units of nm, is…

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Q: The ionization energies for removing successive electrons from sodium are 496 kJ/mol,

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Q: O OOD b. 1) ® OO0 a. (↑) 1s 2s 2p 1s 2s 2p с. (Т) ® OD0 d. (1) 1s 2s 2p 1s 2s 2p

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Q: Arrange the following in order of increasing atomic size. Be, Ga, At, Rb

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Q: d. Se, Ba, F, Si, Sc 14. Use the elements with atomic numbers 1 to 10 and quantum numbers only to…

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Q: 21. The chart below shows the relationship between ionization energy and the increase in atomic…

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.