Question 1

Which subatomic particle is responsible for the identity of an element, and what is its charge?

Accepted Answer

Proton; charge of $$+1$$

Question 2

A neutral atom of aluminum-27 ($$^{27}_{13}\mathrm{Al}) $$contains how many protons, neutrons, and electrons?

Accepted Answer

$$13$$ protons, $$14$$ neutrons, $$13$$ electrons

Question 3

Which of the following ions has 28 electrons, 35 neutrons, and a $$+2$$ charge?

Accepted Answer

$$^{63}\mathrm{Cu}^{2+}$$

Question 4

Which element in the first column of the periodic table has the greatest atomic mass?

Accepted Answer

$$\mathrm{Fr}$$

Question 5

Calculate the atomic mass of gallium if it has two naturally occurring isotopes: $$^{69}\mathrm{Ga} (60.11$$%, 68.926 amu) and $$^{71}\mathrm{Ga} (39.89$$%, 70.924 amu).

Accepted Answer

$$69.72$$ amu

Question 6

Which of the following elements is a metalloid?

Accepted Answer

$$\mathrm{Si}$$

Question 7

Which element is a representative element that is a gas at room temperature and is found in the 2nd Period?

Accepted Answer

$$\mathrm{Ne}$$

Question 8

Based on Dalton's atomic theory, which statement is NOT consistent with his original postulates?

Accepted Answer

Atoms can be divided into protons, neutrons, and electrons.

Question 9

Which of the following electron configurations violates Hund's Rule?

Accepted Answer

Two electrons paired in one $$2p$$ orbital before all $$2p$$ orbitals are singly occupied

Question 10

Which element would have the greatest metallic character based on periodic trends?

Accepted Answer

$$\mathrm{Cs}$$

Question 11

What is the condensed electron configuration for aluminum ($$Z=13$$)?

Accepted Answer

$$[\mathrm{Ne}]\ 3s^2$\ 3p^1$

Question 12

How many valence electrons does a nitrogen atom possess?

Accepted Answer

$$5$$

Question 13

Which of the following is a transition metal in the 5th Period with similar chemical properties to copper?

Accepted Answer

$$\mathrm{Ag}$$

Question 14

Which of the following is a possible value for the shell number $$n of an $$atom?

Accepted Answer

$$n=3$$

Question 15

Which electron configuration represents a violation of the Aufbau Principle?

Accepted Answer

An electron configuration where $$2p$$ orbitals are filled before $$2s is $$filled

Question 16

How many unpaired electrons are present in a vanadium atom ($$Z=23$$)?

Accepted Answer

$$3$$

Question 17

Which of the following ions is most likely to form from a Group 1A element?

Accepted Answer

$$+1$$

Question 18

Which element is a nonmetal and exists as a diatomic solid at room temperature?

Accepted Answer

$$\mathrm{I}_2$$

Question 19

Which of the following best describes the path of an electron within an orbital?

Accepted Answer

Orbital

Question 20

A sample of silver has an atomic mass of $$107.868$$ amu. The Ag-109 isotope ($$108.905$$ amu) is $$48.16\%$$ abundant. What is the mass of the other isotope?

Accepted Answer

$$106.905$$ amu

Elements, Atoms, and the Periodic Table: General Chemistry Study Guide

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