The Element X Has Three Naturally Occurring Isotopes

question 21

Multiple Choice

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu.

• A)219.7
• B)220.4
• C)220.42
• D)218.5
• E)221.0

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Definitions:

Liability Account

An accounting record that represents a company's legal debts or obligations that arise during business operations.

Cash Basis

An accounting method where revenue and expenses are recognized only when cash is exchanged.

Accounts Receivable

Funds that customers owe to a business for products or services they have received but have not yet paid for.

Uncollectible Accounts

Uncollectible Accounts are receivables that a company does not expect to collect and are thus written off as an expense for bad debts.