metelau Flashcards

1
Q

ble mae metlau ar y tabl cyfnodol?

A

ochr chwith

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2
Q

beth yw lledfetelau?

A

sylweddau sydd gyda priodweddau metal ac anfetel

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3
Q

ble mae anfetelau ar y tabl cyfnodol?

A

ochr dde

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4
Q

beth yw priodweddau metelau?

A
  • dargludo trydan a gwres
  • sgleiniog
  • hydrin
  • hydwyth
  • ymdoddbwynt uchel
  • berwbwynt uchel
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5
Q

beth yw hydrin?

A

medru siapio y metel a’i fwrw i haeanau

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6
Q

beth yw hydwyth?

A

medru tynnu mewn i gwifren

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7
Q

pam oes ganddo ymdoddbwynt a berwbwynt uchel?

A

mae ganddo bondiau cryf rhwng ionau’r metel a’r electronnau rhydd = mae angen llawer o gwres i wahanu’r ionau

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8
Q

pam ydy metel yn dargludo trydan?

A

oherwydd mae ganddo mor o electronnau sy’n symud yn rhydd

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9
Q

pam mae metel yn hydrin a hydwyth?

A

electronnau rhydd = caniatau i ionau’r metel llithro dros ei gilydd

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10
Q

pam bod ymdoddbwynt magnesiwm yn uwch na sodiwm?

A

oherwydd mae gan magesiwm gwefr fwy ne sodiwm = wedi colli mwy o electronnau. felly, magesiwm gyda mwy o electronnau rhydd na sodiwm

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